which substance is used to remove rust from metal?\no lye (naoh)\no hydrochloric acid (hcl)\no ammonia…

Brief Explanations:

Rust is iron - oxide. Acids react with metal oxides to form salts and water. Hydrochloric acid and sulfuric acid are strong acids that can react with rust to dissolve it. Lye (NaOH) is a base and ammonia ($NH_3$) is a weak base and they do not react with rust in a way to remove it effectively. Both hydrochloric acid and sulfuric acid can be used to remove rust, but hydrochloric acid is commonly used for this purpose in many applications.

Answer:

B. hydrochloric acid (HCl)