The following are some statements related to VA group hydrides.
I. Reducing property increases from `NH_(3)` to `BiH_(3)`.
II. Tendency to donate lone pair decreases from `NH_(3)" to "BiH_(3)`.
III. Thermal stability of hydrides decreases from `NH_(3)" to "BiH_(3)`.
IV. Bond angle of hydrides decreases from `NH_(3)" to "BiH_(3)`.
The correct statements are
A. I, II, III and IV
B. I, III and IV
C. I, II and IV
D. I and IV