Bronsted-Lowry defines the compound which <u>(A) donates protons</u> as acid.
<h2>Explanation:</h2>
According to this concept, an acid is a substance that donates hydrogen ion in a chemical reaction. Hydrogen ion is same as a proton as it has only one proton in its atom. According to him, a base is that substance that accepts hydrogen in a chemical reaction.
In a general sense, all proton donors are acids and all proton acceptors are bases. The higher the number of hydrogen ion donated, the more acidic the substance.