What "enormous challenge" did McDonald's face in 1990 when it switched from cooking its French
fries in beef tallow to cooking them in pure vegetable oil.
A. finding a vegetable oil that had aromas like those of beef tallow.
B reducing the amount of saturated fat in the new fries
C selecting a different kind of potato that would taste good cooked in vegetable oil
D developing flavor additives to make the new fries taste just like the old one