(C) Human urine is typically acidic ($pH$ approximately $6.0$) because the kidneys actively secrete hydrogen ions $(H^+)$ and ammonium ions $(NH_4^+)$

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Kidneys secrete acids to keep urine acidic

(C) Human urine is typically acidic ($pH$ approximately $6.0$) because the kidneys actively secrete hydrogen ions $(H^+)$ and ammonium ions $(NH_4^+)$ into the filtrate during the process of tubular secretion. This mechanism helps in maintaining the acid-base balance of the body fluids by excreting excess acids.