Suppose New Medical Research Suggests That Consuming 200 Grams of Tofu

Suppose new medical research suggests that consuming 200 grams of tofu everyday helps to prevent heart disease. Widespread knowledge of this research, other things being equal, is likely to have what impact on the market for tofu?

A) shift the whole demand curve to the left
B) there would likely be no effect.
C) movement along the demand curve to the right
D) shift the whole demand curve to the right
E) movement along the demand curve to the left