It is very difficult for an atom to accept a proton. It can only be done under very special circumstances. So A and C are both incorrect. I don't see how D is possible. The atom does lose 1 electron, but how it gets 21 is think air.
The answer is B which is exactly what happens.
The boy’s foot causes the motion. His foot is the one that causes the ball to roll down the hill.
<span>division of Earth's history into time units based largely on the types of life-forms that lived only during certain periods.</span>
B student 2 because you add