Which best compares AC and DC?

a
AC flows in one direction, and DC repeatedly switches direction.
b
AC is used only in generators, and DC is used only in motors.
c
DC is used only in generators, and AC is used only in motors.
d
DC flows in one direction, and AC repeatedly switches direction.
Please Help me, I have no clue what I'm reading, and I'm trying to make a good grade on this formative assesement

B) DC flows in one direction, and AC repeatedly switches directions.

Explanation:

DC stands for direct current, which is a current that constantly flows in only one direction.

AC stands for alternating current, which is a current that repeatedly changes directions.

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< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >