Answer
c)
Work Step by Step
Since he was not telling the truth, there was at least one occasion when he obstructed justice, thus the answer is c).
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 3 - Logic - 3.1 Statements, Negations, and Quantified Statements - Exercise Set 3.1 - Page 121: 58
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