If the earth were 3 times as far from the sun as it is now, the gravitational

Question:

If the earth were 3 times as far from the sun as it is now, the gravitational force exerted on it by the sun would be
a. 3 times as large as it is now
b. 9 times as large as it is now
c. one-third as large as it is now
d. one-ninth as large as it is now

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