Select the option that expresses the given sentence in passive voice.
The teenager delivered the speech.

Correct option is C

The correct passive voice of the given sentence is (c) The speech was delivered by the teenager.
Rules for conversion from active to passive:
· Active voice structure: Subject + Verb + Object
· Passive voice structure: Object + Be form + Past Participle + "by" + Subject
Transformation:
· Active: The teenager (subject) delivered (verb) the speech (object).
· Passive: The speech (object) was delivered (be + past participle) by the teenager (agent).
Example: The letter was written by her yesterday.