Final answer:
The total energy released in the carbon cycle, including the annihilation energy, is 803 MeV.
Step-by-step explanation:
To find the total energy released in MeV in each carbon cycle, we need to consider the overall effect of the reaction:
15N + 1H → 12C + 4He.
The annihilation energy of an extra electron is included in the total energy. The correct answer is (a) 803 MeV.