Ignoring Twins and Other Multiple Births,assume Babies Born at a Hospital

Multiple Choice

Ignoring twins and other multiple births,assume babies born at a hospital are independent events with the probability that a baby is a boy and the probability that a baby is a girl both equal to 0.5.Define event B = {at least one of the next two babies is a boy}.What is the probability of the complement of event B?

A) 0.125
B) 0.250
C) 0.375
D) 0.500