A patient was stung by a wasp on her left hand. After ensuring her ABCs and positioning the bite site, the EMR should ________.

The correct response is to remove any constricting objects. This action is crucial because a wasp sting can provoke a localized allergic reaction, including swelling at the site of the sting. If the swelling progresses and is not monitored, it could potentially restrict blood flow or cause further complications. By removing any constrictive items, such as rings or bracelets, the EMR ensures that circulation is not impaired as the area swells.

While applying ice can help to reduce swelling and relieve pain, it is not the immediate priority after assessing the patient's ABCs and positioning the limb. Administering antihistamines may be appropriate for managing allergic reactions, but it is not within the initial scope of actions for an EMR unless specifically trained or directed by medical control. Elevating the limb can also help with swelling, but it is secondary to the immediate need to remove constricting items to prevent potential complications. Therefore, addressing constriction is the most critical action to take first in this scenario.