Select the option that expresses the given sentence in active voice.
The award was presented to her by the director.

Correct option is C

The correct option is (c) "The director presented the award to her."
Active Voice: In Active voice the subject is the one doing the action.
Passive Voice: In Passive voice the subject is the recipient of the action.
To convert active voice into passive voice the object becomes the subject and the subject becomes the object.
For Simple Past Tense as given in the question the structure for changing a sentence from active to passive and vice versa is:
(Active voice) Subject + V2+ object.
(Passive voice) Object+ was/were + V3+ by + subject.