Answer:
the painless killing of a patient suffering from an incurable and painful disease or in an irreversible coma.
Be prepared, Rehearse jokes, Diffuse your jokes through repetition, Make your laughter part of the joke
The correct answer here would be B, it is used as an adverb. The whole infinitive phrase can be substituted with an adverb (or adverbial phrase) - "in order to wake up on time", with the adverbial meaning, so it is certainly not an adjective or a noun. It is a verb in the infinitive form.