Look at this series: 1.25, 7.5, ____, 270, 1620, ... What number should fill the blank?\nOptions:\n(A) 50\n(B) 65\n(C) 45\n(D) 55\n(E) 40
Use reasoning to answer the following question.
(C)
This is a simple multiplication series.

Each number is 6 times greater than the previous number.

.

Therefore, the answer is (C)