The answer to the question is A
This sentence is compound. it can be broken up into two independent clauses. these clauses are separated by the "and" in the middle.
B. Stationery is the answer.
A. and C. aren't actual words and D. is an adjective referring to something that doesn't move, and is in one spot. Only B. is a noun that refers to office equipment.
AS far as I know your credit score can't be affected by your parents. Your credit score can only be affected by the overdue payments and purchases you make.