The answer is the third one
15a^3b^4c^5----> answer B
you can only multiple like terms so
(5x3)= 15
now just add
a+a^2= a^3
b + b^3 = b^4
c^5 + 0= c^5
Except there are values you want to substitute into the expression, this is what your answer looks like:
Your answer is 160. Sorry about that answer above I laughed reading it hahaha.