25) B

The equations are made to confuse you.

Helium has a mass number of 4 because it has 2 protons and 2 neutrons.

We are given the information that 4 protons are used to make Helium.

Since a Helium atom has 2 protons and 2 neutrons, 2 out of the original 4 protons would have to be converted to 2 neutrons.

Therefore, 2p -> 2n + 2e+

Hence, B is the answer.

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