The client who should be demonstrated first on telemetry unit is one who must be showing symptoms of Normal sinus rhythm and complaining of chest pain, which suggests that option B is the right answer.
Telemetry is the medical process in which automatic measurement and wireless transmission of data from remote sources to healthcare unit takes place due to which the data can be analyzed at some other place by expert doctors and the medication can be provided using telepathy. Normal sinus rhythm refers to the healthy beating of the heart which is characterized by a P wave that precedes every QRS complex, a QRS that precedes every T wave and T wave again end with P wave and so on. When irregularity is observed in heart rate, it causes arrhythmia.
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