Answer
Please see the work below.
Work Step by Step
We know that
A. Each water molecule donates a pair of electrons to copper (II), making the water molecule a Lewis base and the $Cu^{+2}$ ion a Lewis acid.
B. The $AsH_3$ donates a pair of electrons to the boron atom in $BBr_3$ making $AsH_3$ a Lewis base and the $BBr_3$ molecule a Lewis acid.