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The correct choice regarding how OSHA alerts employees to emergencies when using ethylene oxide sterilizers involves the implementation of effective emergency alarms. Emergency alarms are crucial in settings where hazardous materials are handled, as they provide immediate notifications to all personnel regarding potential threats or emergencies, such as gas leaks or equipment malfunctions.

In a work environment where ethylene oxide is used, it is essential to have a reliable system in place that can promptly alert employees to evacuate or take appropriate action. Alarm systems are designed to attract attention quickly and ensure that all employees are aware of the danger, allowing them to respond swiftly and safely.

On the other hand, verbal communication, while important, may not be sufficient in noisy or chaotic situations where rapid responses are necessary. Written notices do not provide immediate alerts and may not reach all employees quickly enough during an emergency. Ethylene oxide itself refers to the chemical in question, not a method of communication or alert system.

Thus, having emergency alarms is a critical safety measure required by OSHA to protect employees working with ethylene oxide sterilizers.