Sentence Correction (SC) | QOTD: Sixty-five million years ago, according to some scientists, an a

E. An event that caused the plant and animal extinctions that mark

The restrictive pronoun 'that' before the plural verb 'mark' refers to the plural noun 'extinctions.'
'That' and 'which' are relative pronouns and hence they can only antecede ta logical noun before them. Whether that logical noun is just in front or farther off is the task
1. In this connection, it may be remembered that unlike 'which,' 'that' is a restrictive pronoun and has there to modify mostly only the noun just before