Questions: 19. What change is needed in sentence 3 ? Delete the comma after skies Change are to is Change geology to Geology Change unforgetilible to unforgettable

The answer is Change unforgetilible to unforgettable

This option suggests removing a comma, but without the full context of the sentence, it's unclear if this is necessary. Generally, commas are used to separate elements in a sentence, and their necessity depends on the sentence structure.

This option involves subject-verb agreement. Without the full sentence, it's difficult to determine if this change is needed. The verb should agree with the subject in number (singular or plural).

This option suggests capitalizing "geology." Typically, "geology" is not capitalized unless it is part of a title or at the beginning of a sentence.

This option corrects a spelling error. "Unforgetilible" is not a correct spelling, and it should be changed to "unforgettable," which is the correct spelling of the word.