A few thousand comets with perihelia very close to the Sun have been observed. These originate from
A) the breakup of a single comet, so these comets all have very nearly the same orbit.
B) gravitational disturbances of the Oort cloud by a nearby star.
C) gravitational disturbances of the Kuiper belt by Jupiter.
D) gravitational disturbances of the Kuiper belt caused by resonances between Neptune and Kuiper belt objects.
Correct Answer:
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