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In which of the following series can be the formula S = \(\f...

In which of the following series can be the formula S = a1r where a is the first term and r is the common ratio, be used to find the sum of all the terms? 

A.

4 + 8 + 16 + 32 + ...

B.

12 + 2 12 + 1212 + 62 12 + ..

C.

481 + 227 + 19 + 16 + ...

D.

128 + 64 + 32 + 16 + ...

Correct answer is D

No explanation has been provided for this answer.