What is the author's purpose in
both "Sick of Lying" and "The
Pinocchio Syndrome"?

The author's purpose in both "Sick of Lying" and "The Pinocchio Syndrome" is

This refers to the main reason why an author writes a text and the message he wants to pass across.

With this in mind, from the complete text, there is the narration about the study of lying and why people engage in it and the effects which lying has.

Read more about purpose of text here:

link

The answer is,

to give readers information about scientific studies of lying

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i think it is b. hope this !