A - Salinity because salinity is how much salt is in water and adding more would increase the salinity.
Answer: That translates to "Which is the potential for action" in English. I hope that is what you were looking for as I have nothing else to base your question off of, as you only put a line of Spanish as your question.
321mL times 6 equals to 1926mL
1926mL in Liters is 1.926L
I would say c is the answer