#### Answer

$3$ years in a relationship, when it is $9$.

#### Work Step by Step

According to the graph, the level of intensity of passion is the highest at $3$ years in a relationship, when it is $9$.

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Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$3$ years in a relationship, when it is $9$.

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