Which option completes 'I need to move this big sofa. () help you with it?'

• A. Why don't I
• B. Why don't we
• C. Can I
• D. Should I

Answer: (A)

When someone says, “I need to move this big sofa,” a natural next move is to take the initiative and offer to help them with the task. Why don’t I help you with it? uses a common idiomatic pattern for making a proactive offer. It shows the speaker is taking charge of the action and directly addresses the task at hand, which fits the context of moving the sofa.

Other options are less fitting here. Can I help you with it? is a direct, polite offer but doesn’t emphasize the speaker taking the lead. Should I help you with it? sounds a bit tentative. Why don’t we help you with it? would shift the proposal to a joint effort directed at the other person, which doesn’t match the speaker’s own plan to move the sofa.