Correct the statement below. As a result of a supernova explosion, every human being on Earth was bombarded on February 23, 1987, by about 100 billion neutrinos; fortunately, neutrinos are harmless elementary particles that are produced in nuclear reactions and that interact very weakly with matter.
(A) neutrinos are harmless elementary particles that are produced in nuclear reactions and that
(B) neutrinos, which are harmless, are elementary particles produced in nuclear reactions and which
(C) neutrinos are harmless elementary particles produced in nuclear reactions and which
(D) these harmless elementary particles are produced in nuclear reactions, and neutrinos
(E) these elementary particles, harmless products of nuclear reactions, are neutrinos that

A. neutrinos are harmless elementary particles that are produced in nuclear reactions and that

Explanation:

The underlined sentence starts from "neutrinos are harmless elementary particles that are produced in nuclear reactions and that".

A) neutrinos are harmless elementary particles that are produced in nuclear reactions and that

(B) neutrinos, which are harmless, are elementary particles produced in nuclear reactions and which. NOT CORRECT

(C) neutrinos are harmless elementary particles produced in nuclear reactions and which

(D) these harmless elementary particles are produced in nuclear reactions, and neutrinos OBVIOUSLY NOT CORRECT

(E) these elementary particles, harmless products of nuclear reactions, are neutrinos that NOT CORRECT

Options B, D, and E are out leaving us with options A and C

C would be have been correct if it wasn't in agreement with the underlined statement.

it should have been written as, "particles which were produced in nuclear reactions and which". Instead of

"neutrinos are harmless elementary particles produced in nuclear reactions and which"

This only leaves us with A as the correct answer.

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