Answer:
B. a substance that can accept a proton from an acid
Step-by-step explanation:
Johannes Brønsted and Martin Lowry independently developed definitions of acids and bases based on compounds abilities to either donate or accept protons (H+ ions).
The acid is the donor of the hydrogen ions while the bass is the acceptor of the hydrogen ions.
Back to the options, the correct option is B. Which is a substance that can accept a proton from an acid. All other options are incorrect.