The correct relative pronoun for each sentence is "which" for sentence 1, "that" for sentence 2, and "which" for sentence 3, as explained below.
A relative pronoun is a word used to introduce a relative clause. This type of clause has the purpose of modifying a noun, that is, of giving more information about it. Relative pronouns also replace or substitute the noun being modified.
Examples of relative pronouns are:
For sentences 1 and 3, the best option is the pronoun "which", since the pronoun appears after a dash or a comma, which makes the clause non-essential. For sentence 2, the best option is "that", since the pronoun is not preceded by a comma or a dash, which makes the clause essential.
Learn more about relative pronouns here:
https://brainly.com/question/17825560
#SPJ1