Question

what action broke off us negotiations with japan?
○ japan’s war with china
○ japan’s invasion of indochina
○ japan’s pact with germany and italy
○ japan’s pact with indochina

Explanation:

The question is about what action broke off US - Japan negotiations. Japan's invasion of Indochina (specifically the move into southern Indochina in 1941) led the US to impose an oil embargo and increased tensions, breaking off negotiations. The other options: Japan's war with China was ongoing but not the direct trigger for breaking off US - Japan negotiations at the final stage; the pact with Germany and Italy (Tripartite Pact) was more about aligning with Axis powers but the invasion of Indochina was a more direct action that provoked the US; the pact with Indochina is incorrect as Japan was invading, not pacting with Indochina.

Answer:

Japan’s invasion of Indochina