The two different extreme variations in a trait are favored in
a. directional selectionc. stabilizing selectionb. disruptive selectiond. alternate selection

Disruptive selection.

Explanation:

Natural selection may be defined as the selection that are favored by the nature and the organism that can adapt in the environment will reproduce and pass down beneficial traits to the next generation. The natural selection acts as main driving force for evolution.

Three different types of natural selection are stabilizing selection, disruptive selection and directional selection. The two different extreme variation in a trait of the population is favored in the disruptive selection. The less extreme trait will be eliminated from the population.

Thus, the answer is disruptive selection.