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

Let us donate the money.

Let the money be donated by us.

The correct passive voice of the given sentence is Let the money be donated by us.

The active voice of the sentence is Let us donate the money. This sentence is in the imperative mood, which is used to give commands or make requests. 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 "us" and the main verb is "donate." The past participle of "donate" is "donated." So, the passive form of the sentence is Let the money be donated by us.

The other options are incorrect because:

• We are told to donate the money. is in the active voice, but it is not the most concise way to express the passive voice of the sentence.
• Let the money is donated by us. is grammatically incorrect. The verb "is" should not be used with the past participle of the verb "donate."
• The money was donated by us. is in the simple past tense, while the original sentence is in the imperative mood.