The expression \dfrac{2021}{2020}-\dfrac{2020}{2021} is equal to the fraction \dfrac{p}{q}, where p and q are positive integers whose greatest common divisor is 1 . What is p ?

**Answer Choices**

A. 1

B. 9

C. 2020

D. 2021

E. 4041

The expression \dfrac{2021}{2020}-\dfrac{2020}{2021} is equal to the fraction \dfrac{p}{q}, where p and q are positive integers whose greatest common divisor is 1 . What is p ?

**Answer Choices**

A. 1

B. 9

C. 2020

D. 2021

E. 4041