Which statement about the nature of salts is scientifically correct?

Correct answer: Salts can be acidic, basic, or neutral

The governing concept is salt hydrolysis and the relative strengths of the acid and base that form a salt. A salt such as sodium chloride gives a nearly neutral solution, ammonium chloride gives an acidic solution, and sodium carbonate gives a basic solution. Hence option C is correct. Options A and B wrongly generalise one nature to every salt, and D confuses acidity with a fixed pH of zero.