A compound sentence contains two or more dependent clauses.
two or more independent clauses.
two dependent clauses and one independent clause.
two independent clauses and one dependent clause.

answer d

explanation:

well, number 1, the 1920s was not economically prosperous until the start of the lend-lease act, which employed large amounts of people in producing equipment for the allies.

b. world war ii is your answer, because wwi had already ended at 1918, and the cold war was after 1945.

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the answer is c. he is an efficient leader who prompts his crew to work quickly .

explanation:

not sure maybe the subject closer to it or subject-verb agreement