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: Look at this series: __, VIII, XI, XIV, XVII, XX, ... What number should fill the blank?

Option A: IX

Option B: XXIII

Option C: XV

Option D: V

Option E: None
Output:
Option D