Sometimes it is not only a book but the book read with an ________________review of it that gives us an understanding of a reality.

The correct option is option 2.The statement talks about an insightful review of a book that gives an understanding of a reality.

Alert means cautious.

Insightful means perceptive.

Rational means based on or in accordance with reason or logic.

Artful means clever or skillful, especially in a crafty or cunning way.

Obtuse means annoyingly insensitive or slow to understand.