Question

from which region does the long - period comets originate?
○ a. kuiper belt
○ b. main asteroid belt
○ c. oort cloud
○ d. saturn rings

Explanation:

Long - period comets are believed to originate from the Oort cloud. The Kuiper belt is the source of short - period comets. The main asteroid belt contains asteroids, not comets. Saturn rings are made of ice and rock particles, not the origin of long - period comets.

Answer:

C. Oort cloud