Question: Let (A) be the area enclosed by a simple closed curve (C), and assume that (C) is oriented counterclockwise. Indicate whether the value of each

Let $A$ be the area enclosed by a simple closed curve $C$, and assume that $C$ is oriented counterclockwise. Indicate whether the value of each integral is $0,-A$, or $A$.
(a) $\oint_{C} x d x$
(b) $\oint_{C} y d x$
(c) $\oint_{C} y d y$
(d) $\oint_{C} x d y$

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