What is the most logical next event?

How to spot ulcer symptoms in horses
Notice any behavioral changes.
Symptoms of gastric ulcers can be nonspecific and hard to notice. Your horse may alter their behavior if they have a stomach ulcer.

Pick your answer from:
(a). Horses with gastric ulcers are usually not behaved fairly negatively, since change in behavior is often due to negative training. See if the horse is overweight.
(b). Their attitude may change and they may become less eager to do things they used to. The horse may act irritably or dazed.
(c). Look for any changes in your horse's posture, breathing, etc. Communicate anything you notice to your horse and make sure they're not experiencing any changes.
(d). This could be due to sensitivity to red blood cells or ulcers that are completely healed. Observe your horse for any behavioral changes that may occur.
(b).