Brianna suffers from episodes of an immoderate fear of danger. when this happens, she suffers from heart palpitations, shortness of breath, and nausea. she remains in this condition for around 10 minutes at a time but sometimes it continues for an hour or more. brianna is most likely to be suffering from

Panic attack

Explanation:

A panic attack is a psychological disorder that is characterized by intense fear with severe physical reaction even if there is not present any genuine reason for fear or apparent reason for the fear. It seems very dangerous because this person feels that he may have a heart attack or maybe dying due to a heart attack. People have maybe one or two panic attacks in their lifetime and the danger of the situation goes out.  

Symptoms:

Thus in the above statement, Brianna suffers from episodes of a panic attack and she stays in this condition last 10 minutes.  

the 2nd option is the answer

answer; /// the above statement is (true);