Several times in the past 2 months, Petra has experienced a racing heart, intense fear that something horrible is about to happen, and an inability to breathe. Petra most likely is suffering from disorder.

panic attacks

Explanation:

Panic attack: In abnormal psychology, the term "panic attack" is referred to as a process in which an individual faces unexpected episodes of "intense fear" that leads to chronic physical reactions in the absence of any apparent cause or genuine danger. An individual who is dealing with panic attack disorder experiences very frightening panic attacks. Panic attacks are often felt like losing control or even an individual may feel that he or she is dying.

Causes: Severe stress, medical conditions, etc.

In the question above, Petra most likely is suffering from panic attacks disorder.

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answer; rational if melanie values sleep more highly than the benefits she expects to receive from attending the class;