Explanation:
The sex of children is decided by the X or Y chromosome inherited from the father.A male has XY chromosomes and a female has XX chromosomes.If a sperm carrying X chromosome from the father gets combined with the X chromosome from female, then the combination will be XX and the child will be a baby girl.If a sperm carrying Y chromosome from the male gets combined with the X chromosome from female, then the combination will be XY, and the child will be a baby boy.Hence, the correct option is (B).