Detailed Instructions: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Q: Question: The fourth proportional to 5, 8, 15 is:

 Option A: 20

 Option B: 22

 Option C: 24

 Option D: 21

 Option E: 23
A:
Option C