Which is the correct passive form of the following sentence ? 'Workers pack the biscuits into boxes'

Which is the correct passive form of the following sentence ? 'Workers pack the biscuits into boxes'

• ক. Worker pack the boxes into biscuits
• খ. The boxes are packed into biscuits by the workers
• গ. The biscuits were packed into workers by the boxes
• ঘ. The biscuits are packed into boxes by the workers