Jupiter’s gravity attracts comets and asteroids

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Jupiter's gravity attracts comets and asteroids
passing near it, substantially increasing the
bombardment rate of the inner moons compared to
that of the outer ones
. But because of Io's high
degree of geological activity, its surface undergoes
more-or-less continuous volcanic resurfacing.






The author's reference to Jupiter's gravity in line 25
serves primarily to
(A) indicate why the absence of craters on Io's
surface is surprising
(B) explain the presence of craters on the surface
of Jupiter's four largest moons
(C) provide an explanation for the lack of geological
activity on Callisto
(D) contrast Jupiter's characteristics with the
characteristics of its four largest moons
(E) illustrate the similarity between Jupiter's four
largest moons and the planets of the solar
system


Why option B is wrong? The portion highlighted in bold in above passage suggests that gravity is responsible for both inner and outer moons. Although the rate is different.

Can anyone please help me.


Thanks & Regards,
Vishal