Q: You are presented with the quiz "What do cells secrete to maintain the proper pH for enzymes to work?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cells secrete acids and bases to maintain the proper pH for enzymes to work" and "acids and bases are electrolytes". So, what's the best answer to the question?

Available choices: (1). Energy; (2). Chemical energy; (3). water conservation; (4). sweating; (5). heat energy; (6). aqueous solution; (7). Organic compounds; (8). electrolytes;
The answer is:
(8).