The tendency of $BF_3$ , $BCl_3$ and $BBr_3$ to behave as Lewis acid decreases in the sequence:

Question

( A ) $BCl_3$ > $BF_3$ > $BBr3$
( B ) $BBr_3$ > $BF_3$ > $BCl_3$
( C ) $BBr_3$ >$BCl_3$ > $BF_3$
( D ) $BF_3$ > $BCl_3$ > $BBr_3$