#### Answer

A. $e$

#### Work Step by Step

We know that logarithms with base $e$ are called natural logarithms and the base $e$ logarithm of $x$ is written as $ln(x)$.
Therefore, the base of $ln(x)$ is $e$.

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

A. $e$

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