Scenario B would be correct. The rules specifically say that while it is legal to onload troops onto friendly transports, they must onload on your turn, and may only be offloaded on your next turn. The U.K may not offload the troops for you or you may not hop scotch using a transport.
Axis & Allies G40 components list
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AXIS & ALLIES 1940 GLOBAL COMPLETE COMPONENT LIST
The Axis Powers
Germany
Japan
ItalyThe Allies Powers
Soviet Union
United States
China
United Kingdom
ANZAC
France**OPENING THE BOXES **Control markers
20 German
20 Russian
40 Japanese
45 American
5 Chinese
55 United Kingdom (including 2 Union Jacks)
20 Italian
5 French
10 ANZACFacilities and Kamikazes
18 Major factories
20 Minor factories
30 Air bases
32 Naval bases
6 Kamikaze tokensUnit trays
1 German
1 Japanese
1 Russian
1 American
1 Chinese
2 British
1 Italian
1 ANZAC
1 American / FrenchPlastic chips
110 Gary plastic chips
30 Green plastic chips
20 Red plastic chipsOther components
6 Red dice
6 Black dice4 Piece folding boards (spans 70"X32")
2 Rule books (Europe 1940 / Pacific 1940)
PLASTIC UNIT PIECES
GERMANY - BLACK
40 Infantry
8 Artillery
9 Mechanized Infantry
12 Tanks
8 Antiaircraft Artillery8 Fighters
9 Tactical Bombers
4 Strategic Bombers2 Battleships
2 Aircraft Carriers
4 Cruisers
6 Destroyers
6 Submarines
6 TransportsJAPAN - ORANGE
40 Infantry
12 Artillery
9 Mechanized Infantry
12 Tanks
8 Antiaircraft Artillery16 Fighters
9 Tactical Bombers
8 Strategic Bombers8 Battleships
8 Aircraft Carriers
8 Cruisers
12 Destroyers
12 Submarines
12 TransportsSOVIET UNION - MAROON
40 Infantry
8 Artillery
9 Mechanized Infantry
10 Tanks
8 Antiaircraft Artillery8 Fighters
9 Tactical Bombers
2 Strategic Bombers2 Battleships
2 Aircraft Carriers
2 Cruisers
4 Destroyers
4 Submarines
4 TransportsUNITED STATES - GREEN
40 Infantry
12 Artillery
15 Mechanized Infantry
12 Tanks
16 Antiaircraft Artillery16 Fighters
15 Tactical Bombers
12 Strategic Bombers8 Battleships
8 Aircraft Carriers
8 Cruisers
12 Destroyers
12 Submarines
12 TransportsCHINA - LIME GREEN
30 Infantry
UNITED KINGDOM - BEIGE
40 Infantry
12 Artillery
12 Mechanized Infantry
16 Tanks
16 Antiaircraft Artillery16 Fighters
12 Tactical Bombers
12 Strategic Bombers8 Battleships
4 Aircraft Carriers
8 Cruisers
12 Destroyers
12 Submarines
12 TransportsITALY - BROWN
20 Infantry
8 Artillery
6 Mechanized Infantry
10 Tanks
8 Antiaircraft Artillery8 Fighters
6 Tactical Bombers
4 Strategic Bombers2 Battleships
2 Aircraft Carriers
4 Cruisers
6 Destroyers
6 Submarines
6 Transports**ANZAC - GRAY **20 Infantry
6 Artillery
6 Mechanized Infantry
8 Tanks
8 Antiaircraft Artillery8 Fighters
6 Tactical Bombers
6 Strategic Bombers4 Battleships
4 Aircraft Carriers
4 Cruisers
6 Destroyers
6 Submarines
6 TransportsFRANCE - BLUE
20 Infantry
8 Artillery
8 Mechanized Infantry
10 Tanks
8 Antiaircraft Artillery8 Fighters
6 Tactical Bombers
2 Strategic Bombers2 Battleships
2 Aircraft Carriers
2 Cruisers
4 Destroyers
4 Submarines
4 Transports********