What is the difference between a proton and a neutron in terms of their constituent quarks?
A) A proton is made of two "up" quarks and a "down" quark, and a neutron is made of two "down" quarks and an "up" quark.
B) A proton is made of two "down" quarks and an "up" quark, and a neutron is made of two "up" quarks and a "down" quark.
C) A proton is made of three "up" quarks, and a neutron is made of three "down" quarks.
D) A proton is made of three "down" quarks, and a neutron is made of three "up" quarks.
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