I believe its C. Atomic numbers represent the number of protons, thus, it can be concluded that an oxygen atom does indeed have more protons than a hydrogen atom :)
<span>She was one of the first to advocate for school nursing (choice B). Through this concept, having nurses on hand to help the students should they become ill, she was able to assure that students were attending school and not experiencing chronic absenteeism.</span>
That is 13, and I have no clue :)