Final answer:
The appropriate type of needle to use when withdrawing liquid from an ampule is a blunt-tipped needle. This type of needle has a rounded end, reducing the risk of accidental needlestick injuries.
Step-by-step explanation:
The appropriate type of needle to use when withdrawing liquid from an ampule is D. Blunt-tipped needle. Ampules are small, glass containers that typically contain medication in liquid form. A blunt-tipped needle has a rounded end, which minimizes the risk of accidental needlestick injuries while withdrawing liquid from the ampule.