What did Linda Bartoshuk and her colleagues at Yale University discover while investigating taste preferences?

A) Supertasters of PTC are more likely to enjoy the flavor of Brussel sprouts.
B) Supertasters are very likely to include grapefruit juice in their diet.
C) There are more nontasters of PTC than there are tasters.
D) There are more supertasters of PTC than tasters.
E) Supertasters of PTC have more taste buds than nontasters.