a^2*b*(2*a^3*b - 5*a*b^4), open the brackets:
a^2*b*2*a^3*b - a^2*b*5*a*b^4, group a's and b's:
2*(a^2*a^3)*(b*b) - 5*(a^2*a)*(b*b^4) and sum degrees (remember c=c^1 for any c):
2*a^5*b^2 - 5*a^3*b^5. So the answer is A.
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