Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.
As a result of logging oyamel firs trees, the habitat of the monarch butterfly population has shrunk.
A)the monarch butterfly population has shrunk.
B)the monarch butterfly population is shrinking.
C)the monarch butterfly population had shrunk.
D)the monarch butterfly population was shrinking.

Question

Quizplus · Accepted Answer

The best choice is "the monarch butterfly population is shrinking."
"Has" is an auxiliary verb of the present perfect progressive form; it indicates something that happened in the past. Since monarch butterflies still exist, their numbers can continue to decline. Therefore, the present progressive form - "to be" and a participle - is the correct form to complete this sentence.

Choose the Answer Which Best Rewords the Italicized Portion