Choose the product.

a3b2 · 4ab3
a .4a3b5
b .4a3b6
c. 4a4b5

In order to find the product of the given values above, simply multiply both of them.
So (a3b2)(4ab3) and we get, 4a^4b^5. In multiplying these, the rule is just to add both the exponents which makes this as the correct answer. The answer therefore is option A. Hope this answer helps.