Use the given graph of f(x) to find the intervals on which f'(x) > 0.
A. f'(x) > 0 on [-3, ?), f'(x) < 0 on (-?, -3]
B. f'(x) > 0 on [-1, ?), f'(x) < 0 on decreasing on (-?, -1]
C. f'(x) > 0 on (-?, -3] ? [1, ?), f'(x) < 0 on [-3, 1]
D. f'(x) < 0 on (-?,?)
Answer: B
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