The characteristics of two different types of reactions are shown below: Reaction A: Protons are gained or lost by the atom of an element.
Reaction B: The identity of the reacting element does not change.

Which statement is true about the two reactions?

A. Valence electrons are not involved in both Reaction A and Reaction B.

B. Valence electrons are involved in Reaction B but not in Reaction A.

C. Valence electrons are involved in both Reaction A and Reaction B.

D. Valence electrons are involved in Reaction A but not in Reaction B.