Concept:Re-insurance is the practice where an insurance company transfers part of its risk to another insurance company.Explanation:The insurer that shares the risk is called the ceding company.The company that accepts the shared risk is called the reinsurer.This arrangement helps spread large risks and reduces the financial burden of big claims.It is different from contribution, where multiple insurers pay for the same loss when a policyholder has several policies.Since the question asks about sharing risks between insurance companies, reinsurance is the correct term.Answer:B. re-insurance