Chapter 16.12, Problem 2CP

Which of the following is a Lewis acid but not a Brønsted acid? (Select all that apply.)

$\begin{array}{l}\text{a)}\hfill \\ {\text{H}}_{\text{2}}\text{O}\hfill \\ \text{b)}\hfill \\ {\text{BCl}}_{\text{3}}\hfill \\ \text{c)}\hfill \\ {\text{OH}}^{\text{-}}\hfill \\ \text{d)}\hfill \\ {\text{Al}}^{\text{3+}}\hfill \\ \text{e)}\hfill \\ {\text{NH}}_{\text{3}}\hfill \end{array}$