Phenylthiocarbamide (PTC) has a bitter taste. Non-tasting ability is reported to be due to recessive allele of the taster gene. In random populations about 30% people lack the ability to taste PTC. A non-taster woman is married to a PTC taster man and has three children. The first two children are born as non-tasters. What is the probability that their third child will be born a non-taster?

A

0.25

B

0.50

C

0.15

D

0.75