Electrophiles

Chemistry

Which of the following pairs represents a set of electrophiles?

(a) $\ce{Br+}$ and $\mathbf{\colon}\ce{CCl2}$
(b) $\ce{H+}$ and $\ce{H2O}$
(c) $\ce{BF3}$ and $\ce{NH3}$
(d) $\ce{H-}$ and $\ce{AlCl3}$