What is the bronsted-lowry definition of a base? a compound that donates protons a compound that accepts protons a substance that increases hydroxide ion concentration a substance that increases hydronium ion concentration

According to Bronsted-Lowry concept, a compound which donates proton is said to be an acid and a compound which accepts proton is said to be base.

Strong bases and acids are completely ionised in aqueous solution whereas weak bases and weak acids ionise partially. The conjugate base is defined as the species which is formed after the loss of proton from an acid and conjugate acid is the species which is formed after the gain of protons.

Hence, Bronsted-Lowry definition of a base is a compound which accepts proton.