Solve the Problem $\frac { 1 } { 2 }$ That a Child Born Is a Boy

Multiple Choice

Solve the problem.
-Assume that the probability is $\frac { 1 } { 2 }$ that a child born is a boy. What is the probability that of the four children in a family two are girls and two are boys?

A) $\frac { 1 } { 8 }$
B) $\frac { 3 } { 4 }$
C) $\frac { 1 } { 2 }$
D) $\frac { 1 } { 4 }$