AMC8 2014 Problem 18

Four children were born at City Hospital yesterday. Assume each child is equally likely to be a boy or a girl. Which of the following outcomes is most likely?
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Answer Choices
A. all 4 are boys
B. all 4 are girls
C. 2 are girls and 2 are boys
D. 3 are of one gender and 1 is of the other gender
E. all of these outcomes are equally likely