Question

quark
x
which of these statements best identifies the particle that is labeled with an x?
○ it is either a nucleus or a proton.
○ it is either a proton or a neutron.
○ it is either a neutron or an electron.
○ it is either an electron or a nucleus.

Explanation:

of three quarks, must be either a proton or a neutron.

Answer:

of three quarks, must be either a proton or a neutron.