Final answer:
The correct change is to alter "families" to "family's" to correctly use the possessive form, showing that the study room belongs to the student's single family.Correct answer is option b.
Step-by-step explanation:
The change that should be made to correct sentence 2 is: b) Change "families" to "family's." This corrects the possessive form which indicates that it is the study belonging to one family. Apostrophes are used in contractions and to form possessive nouns, such as when we indicate ownership or belonging to something or someone. It is important to place the apostrophe correctly to convey the correct meaning, as in the phrase "the average American family's expenses have risen faster than incomes."