Answer:
The correct answer would be A.
Explanation:
The fundamental particles of both neutrons and protons are called quarks. Inside the nucleus are neutrons and protons. So for the nucleus to be held together, bothe the (neu)trons and (pro)tons have to attract, and thus being the fundamental particles, the quarks also have to attract.
Answer:
A. the attraction between the quarks in the proton and neutrons
Explanation:
