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The primary source of energy for the Sun is a series of nuclear reactions in which?

Question by Julia: The primary source of energy for the Sun is a series of nuclear reactions in which?
a. four hydrogen nuclei fuse to form a helium
nucleus.
b. a helium nucleus fissions to form four
hydrogen nuclei.
c. uranium nuclei fission to form several other
elements.
d. two nuclei fuse to form uranium or
plutonium.
e. oxygen nuclei combine to form more massive
nuclei.

Best answer:

Answer by Nitin P
a) I suppose, but I was under the impression it was 2 hydrogen nuclei.
The isotope of helium created is helium-4.

What do you think? Answer below!