If y exceeds x by 20%, then x is less than y by_______?

If y exceeds x by 20%, then x is less than y by_______?

A. 16%
B. 16 1/3 %
C. 16 2/3 %
D. 16 3/5 %
Explanation:
X=100 y=120
120——20
100——-? => 16 2/3%