Answer
(a)
Work Step by Step
Since $f$ is concave up, then $f''$ is positive and this means that $f'$ is increasing. So, (a) is the right answer.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 4 - Applications of the Derivative - 4.4 The Shape of a Graph - Preliminary Questions - Page 194: 1
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