My answer is(A) . It took me 40 seconds.
(A) In the main clause, "that the companies would merge" is the subject and correctly used as a singular. In the subordinate clause, the subject is "when the merger would take place, who among the top executives would be the chief executive, and who, if anyone, would voluntarily leave". "X, Y, and Z" is plural even though each of X, Y, and Z is singular.
(BCDE) They all use "was" in the subordinate clause.
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(A) In the main clause, "that the companies would merge" is the subject and correctly used as a singular. In the subordinate clause, the subject is "when the merger would take place, who among the top executives would be the chief executive, and who, if anyone, would voluntarily leave". "X, Y, and Z" is plural even though each of X, Y, and Z is singular.
(BCDE) They all use "was" in the subordinate clause.
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