1.

1). Covert2). Outgoing3). Conspicuous4). Extraneous

Answer»

From the second paragraph, one can understand that overt behaviours are the ones which can be outwardly seen. The blank (D) desires an adjective DESCRIBING the behaviours that are internal. This ELIMINATES option 2 as the word outgoing means socially confident, friendly (or going away, departing).

Option 3 is also eliminated as conspicuous means clearly visible which CONVEYS an opposite meaning.

Extraneous – irrelevant or not related to the subject (situation) that one is dealing with.

Credulous – tending to BELIEVE something on uncertain or slight evidence

So, option 4 and 5 are eliminated as they are out of context.

Covert means hidden or concealed. This fits right into the passage.

Thus, the correct answer is option 1.



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