Answer
(c).
Work Step by Step
(a) and (b) cannot be correct, because both of them imply causation but we cannot conclude causation from an observational study (but only from an experiment). Thus the answer is (c).
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 9 - Producing Data: Experiments - Check Your Skills - Page 246: 9.20
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