What characteristic of long period comets sugges they come from the Oort cloud?

Question

1. They have longer Type II tails than short period comets.

2. Their orbits have random inclinations with respect to the ecliptic plane.

3. Their orbits are nearly circular.

4. They tend to appear larger in diameter than short period comets.

Answer 1

2

The Kuiper belt is mostly in the ecliptic plane.  The Oort cloud is a cloud all around the solar system.  So comets that have little inclination to the plane are assumed to be Kuiper belts objects and comets with some strange inclination are assumed to be Oort cloud objects.

Answer 2

Its definately number 2.