Question

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identify the sentence that has the relative pronoun underlined and is punctuated correctly.
○ people enjoy riding bicycles and walking in neighborhoods, that are small enough, to get around easily.
○ a greater sense of community which leads to safer and friendlier neighborhoods, is a benefit of walkable communities.
○ walkable communities which are increasing in popularity have many benefits.
○ people who live in communities that are walkable are generally more fit.

Explanation:

1. Analyze the first option: "People enjoy riding bicycles and walking in neighborhoods, that are small enough, to get around easily." Here, "that" is used to refer to "neighborhoods", but when "that" is used as a relative pronoun in a non - restrictive clause (which this seems to be, given the commas), "which" should be used instead of "that". Also, the punctuation with the commas around "that are small enough" is incorrect for a restrictive clause (and it's misused as non - restrictive here).
2. Analyze the second option: "A greater sense of community which leads to safer and friendlier neighborhoods, is a benefit of walkable communities." The relative clause "which leads to safer and friendlier neighborhoods" is a non - restrictive clause (it provides additional information about "a greater sense of community"), so it should be set off by commas. But the comma after "neighborhoods" and before "is" is incorrect. It should be "A greater sense of community, which leads to safer and friendlier neighborhoods, is a benefit of walkable communities."
3. Analyze the third option: "Walkable communities which are increasing in popularity have many benefits." The relative clause "which are increasing in popularity" is a non - restrictive clause (it gives extra information about "walkable communities"), so it should be set off by commas: "Walkable communities, which are increasing in popularity, have many benefits."
4. Analyze the fourth option: "People who live in communities that are walkable are generally more fit." "Who" is a relative pronoun referring to "people" (a restrictive clause, no comma needed as it's essential to identify the people), and "that" is a relative pronoun referring to "communities" (also a restrictive clause, no comma needed as it's essential to identify the communities). The punctuation is correct as there are no unnecessary commas, and the relative pronouns are used correctly in their respective restrictive clauses.

Answer:

People who live in communities that are walkable are generally more fit.