Select the option that expresses the given sentence in active voice.

The evil king was defeated by Gandolf, the savior.

Gandolf, the savior, defeated the evil king.

The correct active voice form of the given sentence "The evil king was defeated by Gandolf, the savior" is Gandalf, the savior, defeated the evil king.

The passive voice of the sentence is "The evil king was defeated by Gandolf, the savior." This sentence is in the simple past tense, which is used to describe an action that happened in the past. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "evil king" and the main verb is "defeat." The past participle of "defeat" is "defeated." So, the passive form of the sentence is "The evil king was defeated by Gandolf, the savior."

The active voice of the sentence is formed by putting the subject of the passive sentence before the verb and removing the word "by." In this case, the subject of the passive sentence is "Gandalf, the savior," and the verb is "defeat." So, the active form of the sentence is "Gandalf, the savior, defeated the evil king."

The other options are incorrect because:

• The savior of Gandolf defeated the evil king." This sentence is incorrect because the subject of the sentence is "savior," which is singular. However, the verb "defeated" is plural.
• Gandolf, the savior, had defeated the evil king." This sentence is in the past perfect tense, which is used to describe an action that happened in the past before another action happened. However, there is no other action mentioned in the sentence.
• Gandolf, the savior, defeats the evil king." This sentence is in the present tense, but the action of defeating the evil king happened in the past.