What causes centripetal acceleration?

Question

a. nothing

b. Centripetal Force

c. Spinning

d. Gravitational Force

Answer 1

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A body moves in a straight line with constant speed unless acted upon by a force.  To get a centripetal acceleration we must apply a centripetal force.  Otherwise the object will not move in a circle ( as per a car trying to go around a corner on black ice)

Answer 2

b. Centripetal Force

of course, of course

Answer 3

Centipedes, of course.

Answer 4

The answer they probably want is "d".  They are clearly stuck in some sort of Newtonian paradigm.  Sometimes the centripetal acceleration is caused by the string tied to the bucket.

Answer 5

It's not the only cause, but the only one of those that's a correct answer is: 

c. Spinning