Which sentences are punctuated correctly? check all that apply.
a. tyler (who loves learning about the past) is reading a book about ancient persia.
b. tyler—who loves learning about the past is reading a book about ancient persia.
c. tyler who loves learning about the past is reading a book about ancient persia.
d. tyler, who loves learning about the past, is reading a book about ancient persia.
e. tyler—who loves learning about the past—is reading a book about ancient persia.
more then one answer!

The answer to your question would be that the sentences that are punctuated correctly are the following ones: Tyler (who loves learning about the past) is reading a book about ancient Persian; Tyler, who loves learning about the past, is reading a book about ancient Persia and Tyler -who loves learning about the past- is reading a book about ancient Persia. That is, your answers would be A, D and E.

The clause set off by the punctuation marks is a non-restrictive relative clause. Non-restrictive relative clauses provide information which is not essential to the meaning of the sentence and therefore are set off with commas, dashes or parenthesis.