Atomic Number ALWAYS relates to number of protons. Sodium's atomic number is 11 so it has 11 protons in the neutral atom it also has 11 electrons in the balanced equation. So best answer would be B
Pinocytosis is the mechanism by which living cells consume liquid droplets. Endocytosis is the general mechanism by which cells ingest foreign substances and collect them in special membrane-bound vesicles within the cell. Pinocytosis is one form of endocytosis.
