A beverage company puts one of the letters in the word MATH under each bottle cap. A prize is given to each person who collects all the letters. Which of the following could be used as a simulation for how many bottles it would take to collect all four letters?

A.
generating random integers from 1 to 100

B.
4 number cubes

C.
tossing a coin 4 times

D.
a spinner with 4 equal sections