Which substance, when added in excess, would fully react with the acid without leaving an alkaline solution? A aqueous ammonia B aqueous sodium hydroxide C calcium carbonate D water

The substance that, when added in excess, would fully react with the acid without leaving an alkaline solution is C calcium carbonate.

Here's why:

Aqueous ammonia (A) and aqueous sodium hydroxide (B) are both bases. If you add them in excess to an acid, they will neutralize the acid, but then you'll have excess base left, which will make the solution alkaline.

Water (D) doesn't react with acids or bases. It's neutral, so it won't change the pH of the acid.

Calcium carbonate (C), however, will react with the acid to produce water, a salt (calcium chloride, if the acid is hydrochloric acid), and carbon dioxide. If you add it in excess, all the acid will react, but there won't be any excess base to make the solution alkaline. The solution will be neutral if all the acid has reacted.