Line integral anyone?

Calculus Level 1

A line integral is a definite integral where you integrate some function f(x,y,z)f(x,y,z) along some path. For which of the following would it be appropriate to use a line integral?

A. The total work done on a charge moving in a circle of radius RR on the xyxy-plane centered at the zz-axis by a charge at the coordinate (R,R,R)(R,R,R)

B. The area under the curve y=x2y=x^2 between x=2x=2 and x=5x=5

C. The total radiation absorbed by a person walking at a uniform rate around an ellipse with minor axis of length aa and major axis of length bb, with a radiation source at the coordinate (b,a)(b,a)

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