Question #9 - My answer was marked wrong on this test. I need the correct answer and explanation for test corrections.

Unstretched Position of the Spring U= KAX ? 2 , 10000 6000 Sort Can time 9. An object of mass m is attached to a spring on a frictionless inclined plane that makes an angle O with the horizontal, as shown above. The object is released from rest with the spring in its unstretched position. As the object moves on the plane, its displacement from the unstretched position is x. What is the magnitude of the work done by gravity as the block slides a distance x? a. m . g . x . sin 0 b. m . g . x . cos 0 c. m . g . x . sin 0 . cos 0 d mg.x sin 0 e. mg.x cos e