Which defines an amendment? A: a change to a constitution
B: a rejection of a proposed bill
C: a vote on accepting a constitution
D: an override of a veto

its d

Explanation:

The power of the President to refuse to approve a bill or joint resolution and thus prevent its enactment into law is the veto. The president has ten days (excluding Sundays) to sign a bill passed by Congress. A regular veto occurs when the President returns the legislation to the house in which it originated, usually with a message explaining the rationale for the veto. This veto can be overridden only by a two-thirds vote in both the Senate and the House. If this occurs, the bill becomes law over the President's objections. A pocket veto occurs when Congress adjourns during the ten-day period. The president cannot return the bill to Congress. The president's decision not to sign the legislation is a pocket veto and Congress does not have the opportunity to override.

the answer is a. laws were enacted in the aftermath of the plot to make it harder to free slaves,increasing sectionalism