Which of the following is a Bronsted-Lowry acid?

A Bronsted-Lowry acid is defined as a substance that donates a proton (H⁺ ion) in a chemical reaction. This definition highlights the role of the acid specifically in the context of proton transfer. Additionally, when an acid donates a proton, it typically results in the production of hydrogen ions (H⁺) in solution, which corresponds to another key characteristic of acids in aqueous environments.

Thus, selecting the answer that states that a Bronsted-Lowry acid donates a proton is correct, as it encapsulates the primary function of a Bronsted-Lowry acid. Furthermore, producing hydrogen ions is a consequence of this proton donation, linking both definitions together and reinforcing why the combination of both is recognized in the correct answer choice.

Therefore, stating that both the donation of protons and the generation of hydrogen ions correspond with the characteristics of a Bronsted-Lowry acid is a comprehensive understanding of what this type of acid entails.