Name the Two Reagents That Are Needed to Visualize Nitrite $\alpha$

Multiple Choice

Name the two reagents that are needed to visualize nitrite in the nitrate reduction test.

A) Sulfanilic acid and 40% sodium hydroxide
B) Sulfuric acid and $\alpha$ -naphthol
C) N,N-dimethyl- $\alpha$ -naphthylamine and sulfanilic acid
D) N,N-dimethyl- $\alpha$ -naphthylamine and sulfuric acid