Final answer:
The most appropriate insurance policy would be Home insurance policy.
Step-by-step explanation:
In this situation, the most appropriate insurance policy would be Home insurance policy.
Home insurance policies typically cover property damage caused by events like rainstorms, including damage caused by water leaking into the property through an open window.
General liability insurance, professional liability insurance, and errors and omissions insurance are more commonly used for situations involving third-party injuries or damage caused by a person's professional services or business operations.