Question

what change, if any, should be made to sentence 1? (1) every fall, thousands of monarch butterflies begin his or her journey from canada to mexico. change \thousands of monarch butterflies\ to \they\ change \his or her\ to \the butterflies\ no change needed change \his or her\ to \their\

Explanation:

The subject "thousands of monarch butterflies" is plural. The possessive pronoun "his or her" is singular and does not agree with the plural subject. The correct possessive pronoun for a plural subject is "their". Changing "thousands of monarch butterflies" to "they" would create a subject - verb agreement issue as "they" can't be used as a subject replacement here in a way that makes sense. Changing "his or her" to "the butterflies" would be grammatically incorrect as it would disrupt the possessive relationship. So the correct change is to replace "his or her" with "their".

Answer:

D. Change "his or her" to "their"