Abrønsted-lowry base is defined as a substance that? a. acts as a proton donor b. increases [h+] when placed in h2o c. increases [oh-] when placed in h2o d. decreases [h+] when placed in h2o e. acts as a proton acceptor

According to Brønsted-Lowry theory, 
                    Acid is any compound which transfers or donate H⁺.
                    Base is any compound which accepts H⁺.

Example:
                               NH₃  +  HCl   →   NH₄⁺  +  Cl⁻

In Above Example NH₃ is acting as a Base, while HCl is acting as a Acid.

Result:
          Option-E. (Acts as a proton acceptor) is the correct answer.

7is b8 is d9 is c10 is a11 is d