Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: This is a simple multiplication series. Each number is 6 times greater than the previous number.
 The question and answer:
user
Look at this series: 1.25, 7.5, ____, 270, 1620, ... What number should fill the blank?
Options:
(A) 50
(B) 65
(C) 45
(D) 55
(E) 40
The answer is (C)
assistant