The process in which hydrogen is introduced to vegetable oils to make them saturated is known as

a. bonding.

b. reduction.

c. searing.

d. hydrogenation.

The correct answer is D. hydrogenation. Even the name says that it is the introduction of hydrogen since hydrogenation means hydrogenizing something, or adding hydrogen. This process turns these oils into saturated fats and you shouldn't eat too many of these, just like any other fats.