Which letter indicates subatomic particles that each have a mass of 1 amu?

Both Protons and neutrons have a mass of 1 amu,
those are both located in the center.
Protons are shown by a plus sign (+) and neutrons are shown by a circle (o).
Both B and C are correct.
Answer:
B. Neutrons and C. Protons
Step-by-step explanation:
Both neutrons and protons have a mass of 1amu.