The Congressional Practice of "Ping Pong" Occurs When

The congressional practice of "ping pong" occurs when

A) Congress passes a new version of a law that was previously struck down as unconstitutional by the federal judiciary.
B) Congress passes a new version of a law that was previously vetoed by the president.
C) there is a divided Congress and the House and Senate exchange amendments in order to reach agreement on the final version of a bill.
D) a bill is passed in one house of Congress but not passed in the other.