Final answer:
In New York, major medical plans have a maximum co-insurance rate of 50%. This is the highest percentage of medical costs that an insured individual is expected to cover after the deductible is met.
Step-by-step explanation:
The question pertains to the maximum co-insurance rates that apply to major medical plans in New York. In such plans, after the deductible is paid, policyholders often share costs with their insurer through a co-insurance arrangement.
This rate represents the percentage of costs that the insured party is responsible for paying. For major medical plans in New York, the co-insurance amount cannot exceed 50%. Therefore, the correct answer to the question is d) 50%.