Answer:
B
Step-by-step explanation:
So for the first square we Have ab*a
When you multiply variables then you add up their powers so b^1a^1+a^1= (a^2)(b^1)
Second box is -3 * a which is equal to -3a
third box is 2b * ab = 2ab^2
fourth box is -3 *2b = -6b
