Answer
c)
Work Step by Step
$r=0$ at $\theta=90^\circ$, thus it cannot be b) or d).
Furthermore $r=-4$ at $\theta=180^\circ$, thus it is not a), hence it is c)
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 8 - Section 8.6 - Equations in Polar Coordinates and Their Graphs - 8.6 Problem Set - Page 469: 75
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