In the sentence below, the word in capital letters carries the emphatic stress. Choose the question to which the sentence is the appropriate answer. The manager signed the contract YESTERDAY.

Emphatic stress falls on the piece of information the speaker wants to highlight, and that information answers the question being asked. Stressing 'yesterday' answers a question about time. A question about who signed would stress 'manager', one about what was signed would stress 'contract', and one about rejecting would stress 'signed'.