20. What are all values of $k$ for which $\int _ { - 3 } ^ { k } x ^ { 2 } d x = 0$ ?
(A) - 3
(B) 0
(C) 3
(D) -3 and 3
(E) $- 3,0$, and 3
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20. What are all values of $k$ for which $\int _ { - 3 } ^ { k } x ^ { 2 } d x = 0$ ?\\
(A) - 3\\
(B) 0\\
(C) 3\\
(D) -3 and 3\\
(E) $- 3,0$, and 3\\