He is deluding himself with false hopes.

Answer: Option C

Satisfying : giving fulfilment or the pleasure associated with this.
Entertaining : providing amusement or enjoyment.
Misleading : giving the wrong idea or impression.
Assuring : tell someone something positively to dispel any doubts.
Deluding : make (someone) believe something that is not true.

Synonym of Deluding is Misleading