Final answer:
A medical assistant should insert the needle at a 15-degree angle to the skin during a venipuncture to ensure proper entry into the vein and reduce discomfort for the patient.
Step-by-step explanation:
The correct angle to insert a needle during a venipuncture is a) 15-degree angle to the skin.
Inserting the needle at a 15-degree angle allows for proper entry into the vein while minimizing discomfort for the patient. This angle also helps ensure accurate blood flow and reduces the risk of complications.
It is important for medical assistants to receive proper training and guidance on venipuncture techniques to ensure patient safety and success in obtaining blood samples.