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A function $f$ is increasing on an interval if, on that interval:
A$f(x) > 0$ for all $x$ in the interval at any chart point
B$f'(x) > 0$ for all $x$ in the interior of the interval here
C$f''(x) > 0$ for all $x$ in the interior of the interval here
D$f(a) > f(b)$ for endpoints $a < b$ in the interval
Answer & Solution
Correct answer: B. $f'(x) > 0$ for all $x$ in the interior of the interval here
$f' > 0$ on the interval $\Rightarrow f$ strictly increasing on that interval.
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