An individual who has been experiencing persistent anxiety for the past 6 months and unable to specify the cause or source of her nervous feelings likely suffers from

The correct answer is: Generalized Anxiety Disorder.

Explanation:

Generalized Anxiety Disorder is a mental disorder characterized by a persistent preoccupation for life in general.

This preoccupation can lead the individual to experience dysfunctionality varying in degrees. Dysfunctionality can be understood as an inability or an impairment to function normally in daily life.

An individual diagnosed with GAD (General anxiety disorder) worries excessively about life in general. The thoughts are disproportionate and the individuals are unable to specify the cause or source of the nervous feelings.

In conclusion, the individual suffers from Generalized Anxiety Disorder.