Select the most appropriate option to fill in the blank.

She's been off work with __________ stomach.

an upset

The most appropriate option to fill in the blank is:

☀ an upset

The sentence would read: "She's been off work with an upset stomach."

Explanation: "An upset stomach" refers to a digestive discomfort or disturbance. It's the correct term to use in this context. The other options don't fit the context:

• An overset: This isn't a common term for describing a stomach condition.

• An agitated: "Agitated" describes a state of emotional distress, not a stomach condition.

• A perturbed: "Perturbed" also refers to emotional disturbance, not a stomach condition.