Which of the following facts is not correct ?

Question

$\begin {array} {1 1} (A)\;\text{ Elements of Group 13 do not react directly with hydrogen} \\ (B)\;\text{The boron hydrides are know as boranes} \\ (C)\;\text{The structure of diborane is $H_3B - BH_3$} \\ (D)\;\text{ Aluminium hydride exists as white polymer} \end {array}$