It would be the phrase "A. Look before you leap," that is most likely to be considered a cliché, since this is a very common and well-understood phrase in the English language, unlike the others.
The Supreme Court's role is the final judge in all cases involving laws of congress and constitution.
The compromise of 1850 overturned the Missouri Compromise and left the overall issue of slavery unsettled.
The answer is B
I'm black trust me I know