Assume That the Probability of the Birth of a Child $\frac { 127 } { 128 }$

Assume that the probability of the birth of a child of a particular gender is 50%. In a family with seven children, what is the probability that there is at least one girl?

A) $\frac { 127 } { 128 }$
B) $\frac { 59 } { 128 }$
C) $\frac { 3 } { 8 }$
D) $\frac { 3 } { 32 }$
E) $\frac { 43 } { 128 }$