Two People (Both Heterozygotes) Are Able to Taste a Chemical

Multiple Choice

Two people (both heterozygotes) are able to taste a chemical substance called PTC. The ability to taste PTC is caused by a dominant allele (T) . The inability to taste PTC is caused by a recessive allele (t) . What proportion of their children would be expected not to be able to taste PTC?

A) 3/4
B) All
C) 1/4
D) 2/3
E) none