This diagram shows a ball rolling from left to right along a frictionless surface. In which sections will the ball be subjected to an unbalanced force?
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Section 1
Section 2
Section 3
Section 4
Section 5
O A. Sections 1 and 4
OB. Sections 2 and 5
O O O O
C. Sections 1.3, and 4
D. Sections 3 and 4