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.
Input: Question: A cylindrical water tower with radius 14 m and height 20 m is 3/4 full at noon. Every minute, .08 m3 is drawn from tank, while .03 m3 is added. Additionally, starting at 1pm and continuing each hour on the hour, there is a periodic drain of 4 m3. From noon, how many hours will it take to drain the entire tank?

Option A: 420 2/7

Option B: 420 6/7

Option C: 421

Option D: 421 3/7

Option E: 420
Output:
Option E