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.  

tending to cause harm

the correct answer is:   [d]:   " espionage " .

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