Which of the following statement is correct?

The correct option is B $BC{l}_3$ and $AlC{l}_3$ are both lewis acids and $BC{l}_3$ is stronger than $AlC{l}_3$.
Halides of group 3 are Lewis acids because they have only 6 electrons in valence shell. The acidic character of halides ofgroup 13 decreases down the group due to increase in size.

$\therefore BC{l}_3$ and $AlC{l}_3$ both are Lewis acids and $BC{l}_3$ is stronger Lewis acids than $AlC{l}_3$.