Answer:
The meaning of the word "automation" in the sentence "the automation of telephone answering frustrates many people" is:
A.the use of machines that work on their own
According to the given question, we are told that the way the telephone answering is automated, frustrates a lot of people.
The word automated means done automatically, or by its self. As a result of this, we can infer that the meaning of the word as used in the sentence is that the machines work on their own
The other options are incorrect because they do not show or convey the idea that the machines do the answering on their own, without any external help.
Therefore, the answer is option A.
