Select the correct Active/Passive form of the given sentence.

Let us help the blind to cross the road.

Let the blind be helped to cross the road.

The correct answer is option: 1:  Let the blind be helped to cross the road.

The explanation:

1. Let the blind be helped to cross the road.
   This option is in the passive voice but is not a direct transformation of the original imperative sentence. It changes the tone and context slightly.

2. The blind should be helped to cross the road.

   *(Let is not there)
   This option is in the passive voice but it changes the sentence to a suggestion rather than an imperative command.

3. We should help the blind to cross the road.

   *(The subject remains the same: We/us)
   This option is an active voice statement but reflects the intended meaning of the original sentence.

4. The blind may be helped to cross the road.

   *(May remains the same in active/passive. There is no "may" is the question therefore, there can't be may in the answer). This option is passive and indicates possibility, which doesn't fully capture the imperative tone of the original sentence.

The best option that retains the imperative nature of the original sentence while converting it to passive voice is:

Option 1: Let the blind be helped to cross the road.