#### Answer

Option $C$

#### Work Step by Step

The graph has:
no lower limit so infinity will be used;
an upper limit of $-6$. Since a bracket was used, $-6$ is included.
Therefore, the interval is: $\color{blue}{(-\infty, -6)}$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

Option $C$

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