Answer:
The correct option is D.
Explanation:
It is given that Christopher took out a 4 year loan for $1150 at a sports-equipment store to be paid back with monthly payments at a 4.2% APR, compounded monthly.
The formula for amount after compound interest is

Where, P is principal, r is rate of interest, n is number of time interest compounded in a period, number of periods.
According to the given information,
P=1150
r=0.042
n=12
t=9
Put these values in the above formula,



Christopher owe $1186.74 when he begins making payments. Therefore the correct option is D.