One characteristic of cerebral palsy is:

Cerebral palsy is primarily characterized by movement and posture issues that result from abnormal brain development or damage to the brain. Involuntary movements are a common feature of this condition, which can manifest as spasticity (where the muscles are stiff and tight), athetosis (involuntary, uncontrolled movements), or a combination of various motor control issues. These involuntary movements can affect coordination and balance, leading to challenges in performing daily activities.

The other options—mental illness, high blood pressure, and weak bones—are not direct characteristics of cerebral palsy. While individuals with cerebral palsy might experience other health conditions or complications, they are not defining traits of the disorder itself. Understanding the primary features of cerebral palsy can assist in providing appropriate support and interventions for those affected by it.