Use the Distributive Property to Rewrite the Sum or Difference $$6 a + 10 a$$

Multiple Choice

Use the distributive property to rewrite the sum or difference as a product. Simplify the answer if possible.
- $$6 a + 10 a$$

A) $16 a$
B) $- 4 a$
C) $4 a$
D) $30 a$