Choose the most natural spoken response to complete the conversation between two friends.

Sarah: "Thanks so much for helping me move this heavy sofa!"
John: "_____. Just let me know if you need a hand with the armchair."

The correct answer is No worries.

No worries is a very common and natural way to respond to "thank you" in friendly, spoken English.

• Never mind is used to say "forget it" or "it's not important," not to reply to thanks.

• I beg your pardon is formal and used to ask someone to repeat themselves.

• It does not matter sounds dismissive and mildly rude in this context.