Which of the following is incorrect?

Question

A. Most of the sun's mass is made up of helium.
B. Nuclear fusion in the sun produces helium.
C. Helium in the sun comes from the fusion of hydrogen nuclei.
D. In the sun, neutrons are produced in the process of nuclear fusion.

Answer 1

A is totally wrong.
B is correct, in that the end product of nuclear fusion in the sun is helium. There are several steps along the way, though.
C is partially correct - helium is created, but the Sun also started out with roughly 25% helium, so not all of the helium in the sun comes from hydrogen fusion.
D is technically correct, but fusion doesn't create solitary neutrons, so one could possibly argue that it is incorrect, depending on the interpretation.

Answer 2

I agree, "A" is the incorrect answer. The majority of the sun's mass today, is comprised of Hydrogen.

Answer "D" does seem odd. one could agrue that the theoretical result is actual protons not neutrons...

Answer 3

A