In a certain year the price of gasoline rose by 20 \% during January, fell by 20 \% during February, rose by 25 \% during March, and fell by x \% during April. The price of gasoline at the end of April was the same as it had been at the beginning of January. To the nearest integer, what is x ?

**Answer Choices**

A. 12

B. 17

C. 20

D. 25

E. 35