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Telemetry monitoring is the correct choice for a patient showing arrhythmias because it allows for continuous observation of the heart's electrical activity in real time, which is crucial for detecting and diagnosing various types of arrhythmias. This method typically involves placing electrodes on the patient's chest, which are connected to a monitor that continuously records the heart rhythm. If any irregularities occur, such as arrhythmias, they can be identified immediately, allowing for timely intervention.

Holter monitoring, while also useful for detecting arrhythmias, is typically employed for longer-term monitoring usually over 24 to 48 hours. This method records heart activity during the patient's normal daily activities but does not provide continuous real-time information like telemetry does.

ECG stress testing is used primarily to evaluate the heart's performance under stress or exertion, which is not the primary concern in managing acute arrhythmias. It is not designed for continuous monitoring but rather for assessing how the heart functions during physical activity.

Pulse oximetry measures the oxygen saturation level in the blood and does not directly assess arrhythmias or the heart's electrical activity. It's an important tool for evaluating respiratory function rather than cardiac rhythms.

Thus, telemetry monitoring is the most appropriate choice in this scenario for continuous and real