Set A has 20 elements, and set B has 15 elements. What is the smallest possible number of elements in A \cup B, the union of A and B ?

**Answer Choices**

A. 5

B. 15

C. 20

D. 35

E. 300

Set A has 20 elements, and set B has 15 elements. What is the smallest possible number of elements in A \cup B, the union of A and B ?

**Answer Choices**

A. 5

B. 15

C. 20

D. 35

E. 300