Change the voice "Set the thief to catch the thief"?

Let the thief to catch the thief

Let the thief be set to catch the thief

Thief is set to catch the thief

None of these

Explanation

The correct answer is: Set the thief to catch the thief is a idiomatic expression, and the correct changed voice (passive voice) would be: "Let the thief be set to catch the thief".