b. Narcolepsy
Explanation:
Consuela involuntarily fell asleep during a presentation. Thus this is a case of a sleep disorder termed as Narcolepsy. A person suffering from this disorder suffer from sleep attacks. He feels excessively sleepy while doing some work and falls asleep involuntarily any time.
The other options cannot be a choice because Cataplexy refers to loss of muscle action. Ataxia refers to a degenerative disorder of nervous system that has symtoms similar to being drunk. Dyspnea refers to shortness of breath.
