Final answer:
The situation described in the question relates to strict liability in law, which holds a person responsible for their actions regardless of their level of care or caution.
Step-by-step explanation:
The situation described in the question relates to strict liability in law. Strict liability holds a person responsible for their actions regardless of their level of care or caution. In this case, Darlene's wild mustang jumped the fence and caused injury to Paul's daughter. Even if Darlene acted with all reasonable care and caution, there may still be liability for the damages caused.