The correct options are
A BnHn+4
C BnHn+6
The correct representation of boranes include (A) BnHn+4, called as nido-boranes and (B) BnHn+6, called as arachno boranes.
(C) BnH2n+2 is not a correct representation of boranes.
Note: BnHn+6 are less stable than BnHn+4