Regarding the hydrides of group $15$ elements $EH_{3}$ $(E = N, P, As, Sb, Bi)$, select the correct statement from the following:
$A$. The stability of hydrides decreases down the group.
$B$. The basicity of hydrides decreases down the group.
$C$. The reducing character increases down the group.
$D$. The boiling point increases down the group.
Choose the correct answer from the options given below:

• A
  $A, B$ & $C$ only
• B
  $A$ & $D$ only
• C
  $A, B, C$ & $D$
• D
  $B$ & $C$ only