Final answer:
Agnes's round-trip travel accident policy is an example of Limited risk insurance, which covers specific risks during travel and is purchased on a per-trip basis.
Step-by-step explanation:
Agnes's purchase of a round-trip travel accident policy before leaving on a business trip is an example of a Limited risk insurance. This type of insurance provides coverage for very specific risks for a limited time period, often related to travel, such as accidents or death during the trip. It does not cover general health issues, credit accidents, or business expenses, which rules out options B, C, and D respectively. A travel accident policy is usually purchased on a per-trip basis and is meant to protect the purchaser from unforeseen events that could occur while traveling.