Final answer:
The correct answer is A) temporary, which refers to a dental restoration expected to last about 6 months as it serves as a protective measure while awaiting a more definitive treatment.
Step-by-step explanation:
The correct answer to the question of which type of restoration is expected to last about 6 months is A) temporary.
A temporary restoration is placed to protect a tooth while waiting for a more definitive treatment. In contrast, a B) permanent restoration is designed to last for many years under normal conditions. C) Intermediate restorations are not a recognized category in dental terminology, and D) long-term restorations would imply a longer duration than temporary but not quite as long-lasting as permanent restorations.