Proton β+ Decay Products Steps:

• Identify the decay type: A proton decaying to a neutron indicates β+ (beta plus) decay, not β-.
• Recall the β+ decay process: Proton (p) → neutron (n) + positron (e+) + neutrino (ν).
• Confirm products: Besides the neutron, the emission is a positron and an electron neutrino.
• Match to choices: Positron and neutrino corresponds to option C.

Why C is correct:

• In β+ decay, the reaction p → n + e+ + ν follows conservation of charge and lepton number, producing a positron (positive electron) and neutrino.

Why the others are wrong:

• A: Electron and neutrino occur in β- decay (neutron to proton), not proton to neutron.
• B: Electron and antineutrino are β- decay products, opposite to this process.
• D: Antineutrino pairs with positron in some weak interactions, but β+ decay emits a neutrino, not antineutrino.

Final answer: C