Fumble is to Finesse as Malign is to A) Slander B) Extol C) Criticize D) Assurance

Fumble means doing something in clumsy manner and the meaning of Finesse is having extreme skill in doing things and so given is the opposite of it.
similarly meaning of Malign is speak about (someone) in a spitefully critical manner and so opposite of it is Extol which means praise someone heavily.