Question: Look at this series: F2, __, D8, C16, B32, ... What number should fill the blank?
Options:
(A) A16
(B) G4
(C) E4
(D) E3
(E) F2 Let's think first. Some random reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Answer: Option C
The letters decrease by 1; the numbers are multiplied by 2. The final answer: (C).