The answer is 12. Next time try all of the answer option on your calculator first. I just tried each one
2+2 = 4. Bro it was so hard. Did i helped you?
Since as of now we're saying that the probability of having a girl is 1/2, we can say:
1/2 * 1/2 * 1/2 * 1/2, because then you're saying a one half chance of having a girl times another one half chance of having a girl, etc.
That ends up to be 1/16.