【单选题】

Questions 15 to 17 are based on the following passage.At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.

According to the speaker, what does the veto message explainA．Why the President opposes a bill.
B．How lawmakers want to revise a bill.
C．Why a deadline has not been met.
D．When lawmakers plan to end their session.