Which one best describes comparison shopping

a. you are trying to decide if you should buy the size 5 levi shorts in denim or blue denim

b. you cannot decide between the quarter-pound burger with white cheese and all the toppings or the one yellow cheese and all toppings except pickles

c. you cracked a wheel on your skateboard so you call up two different repair shops to see if they can fix your cracked wheel and how much it would cost

d. you want to see the new movie coming out tonight so you check two different theatres to see which show times would work best for you