Choose the option that is the active form of the sentence.

The politician’s speech was loudly cheered.

The audience loudly cheered the politician’s speech.

The correct option that is the active form of the sentence is The audience loudly cheered the politician’s speech.

The other options are incorrect because:

• The politician’s speech was loudly cheered is in the passive voice.
• The audience was loudly cheered by the politician’s speech is also in the passive voice.
• The audience had been loudly cheered by the politician is in the past perfect tense, while the original sentence is in the present tense.
• The audience cheer the politician’s loud speech is grammatically incorrect. The verb "to cheer" is followed by a direct object, but the phrase "the audience cheer" is not a direct object.