Answer:
B, C
Explanation:
A.) When you multiply 32.4 x 103, the decimal moves 3 places to the right.

No, it is 2 places to the right.
B.) When you divide 32.4 by 102, the decimal moves two places to the left.

Yes. If we consider 32.4 and 0.32.
We obtain 0.32 by moving the number 32 decimal two places to the left
C.) When you multiply 0.32 x 102, the decimal moves 2 places to the right.

Yes
D.) When you multiply 3.24 by 102, the answer is 3,240.

No
E.) When you divide 324 by 102, the answer is 3.24.

No