Select the option that is the passive form of the sentence.

We have chosen the colour of the new car we want to buy.

The colour of the new car we want to buy has been chosen by us.

The correct passive form of the sentence "We have chosen the colour of the new car we want to buy" is The colour of the new car we want to buy has been chosen by us.

The other options are incorrect because:

• The colour of the new car we want to buy can be chosen by us is in the active voice, not the passive voice.
• The colour of the new car we want to buy had been chosen uses the past perfect tense, not the present perfect tense.
• The colour of the new car we want to buy is being chosen by us uses the present continuous tense, not the present perfect tense.