A Intending to Murder B by Poison, Purchases Poison and Mixes

A intending to murder B by poison, purchases poison and mixes the same with a glass of water. He gives the glass to the bearer to serve B. the bearer while approaching B loses balance and the glass drops out of his plate. Which one of the following statements is correct in this context?

A) A has committed no offence.
B) A has committed the offence of attempt to commit culpable homicide.
C) A has committed the offence of abetments
D) A has committed the offence of attempt to murder.