a_{1} = 4 and a_{n} = 2(a_{n_1})^{2}?

A: 8, 16, 32

B: 4, 16, 32

C: 8, 64, 128

D: 4, 32, 2048

a1=4, a2=32, a3=2048

answer is C..............................best me.......

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