Black holes/gravitational attraction

[Jonathan Teas]

Hi,
I am currently enrolled in a physics 101 class and I am trying to understand a concept/question.

"If the sun collapsed into a black hole, the Earth gravitational attraction would be
a.same,b.more,c.less,d.none of these

I don't even know where to start, we never even went over black holes never mind the gravitational atrraction between them and another object.

I know Gm1m2/r^2 . but i don't know if a planet/star were changed into a black hole what happens to the mass.
thank you for helping.

 

[PhanthomJay]

You can only assume that the black hole would have the same mass of the sun as it exists today (There is no indication that the sun will ever become a black hole, but this problem only is a 'what if' question, so it doesn't matter).