The Sun generates most of its light through a series of nuclear reactions called

Question

The Sun generates most of its light through a series of nuclear reactions called the proton-proton chain. The overall process of these nuclear reactions can be summarized as 4 1H ? 2He + 2? + 2? + 2? where ? is a small neutral particle called a neutrino, and ? is a photon (a particle of light), which is also neutral. The pre-subscripts on the element symbols H (hydrogen) and He (helium) indicate the number of protons in the nucleus of each element. What is the charge of the unknown entity "?" ?

Its one of the below, I only have one shot to get it right.
+2e
+e
-e
-2e

Explanation / Answer

must be +e

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