a2 + 5a – 3a2

A. 5a + 2a2
B. 5a – 2a2
C. 2a2 + 5a
D. 5a – 3a2

Combining like terms, we have:

a2 - 3a2 + 5a

Simplifying further, we get:

-2a2 + 5a

Therefore, the answer is B. 5a - 2a2.