The correct option is B Furniture is being made by the carpenter.
‘Furniture is being made by the carpenter.’ is the correct answer. In the passive voice, the receiver of the action ‘furniture’ appears first in the sentence. It is followed by the form of the ‘be’ verb ‘is’, the verb ‘being, the past participle form of ‘make’ which is ‘made’, the preposition ‘by’ and the doer ‘the carpenter’.