Answer:
The positively charged subatomic particle in the nucleus of an atom is the proton.
Step-by-step explanation:
Atom; is not correct because it is not a subatomic particle, but instead, those particles are part of it.
Protons; is correct because they are the subatomic particles that are positively charged.
Electrons; is not correct because they are subatomic particles that have a negative charge.
Neutrons; is not correct because they are subatomic particles that have no charge,
Electrical charge; is not correct because it is not a subatomic particle, and it developes from the interaction of them.