Answer: C

Explanation:

The number of digits (least) for

10^n = (n+1) Where,

n \geq 0.

So, The number of digits (least) for

10^{100} are

100 + 1 = 101Thus the answer is C.

Or, you can see that there are one hundred

0's followed by

1 (to the right of

1) and the least number of digits would be number of

0's plus

1 ==>

100+1=101 _________________

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