What symptoms are most likely caused by repeated exposure to methyl methacrylate?

The choice indicating skin irritation and headache is most likely the correct answer because repeated exposure to methyl methacrylate is known to affect the skin and nervous system. Methyl methacrylate can cause contact dermatitis, leading to significant skin irritation. Additionally, inhalation of this irritant can result in central nervous system effects, including headaches, as it has the potential to provoke symptoms like dizziness and cognitive disturbances.

While other symptoms such as pulmonary hypertension may be associated with various chemical exposures, they are not primarily documented for methyl methacrylate. Likewise, bradycardia is related to heart rate conditions and is not a typical response to exposure to this chemical. Therefore, the combination of skin irritation and headache aligns well with the established effects of methyl methacrylate exposure, making it the most accurate choice.