Hi. Which of the underlined follow-ups to the response "Yes, I do" in this made-up dialogue correct and natural?<br/>Thank you in advance for your help.<br/><br/>A: Do you need anything?<br/>B: Yes, I do.<br/><u>A: OK. What do you need? or A: OK. What is that you need?</u><br/><u>B: I need a pencil.</u>