Answer: a. A joint resolution requires the President's signature to become law.
Explanation: A joint resolution in Congress is similar to a bill, but it has a few key differences. First, it must be passed by both the House and Senate in identical form, just like a bill. However, a joint resolution also requires the signature of the President to become law, whereas some bills may become law without the President's signature. Joint resolutions are often used for special circumstances or temporary matters, such as declaring war or approving a temporary budget.