I. Reducing property increases from NH3 to BiH3
II. Tendency to donate lone pair decreases from NH3 to BiH3
III. Thermal stability of hydrides decreases from NH3 to BiH3
IV. Bond angle of hydrides decreases from NH3 to BiH3
The correct statements are
(a) I,II,III and IV
(b) I,III and IV
(c) I,II and IV
(d) I and IV