The sum of first 20 terms of the sequence 0.7, 0.77, 0.777, ….. , is

Question

( A ) $\frac{7}{81}(179 - 10^{-20})$
( B ) $\frac{7}{9}(99 - 10^{-20})$
( C ) $\frac{7}{9}(99 + 10^{-20})$
( D ) $\frac{7}{81}(179 + 10^{-20})$