Option 1: Warily -> means cautiously or carefully, opposite of unrestrained.
Option 2: Incontinently -> means without restraint, impulsively, or immediately.
Option 3: Appraising -> means evaluating or assessing something.
Option 4: Juvenile -> means young or immature.
Hence, Option 2: Incontinently -> In the passage, "Incontinently, we fled" describes how they fled without restraint or control when faced with the mad elephant. The word literally means "in an uncontrolled or impulsive manner," which is a synonym for unrestrained -> correct