Final answer:
Lu will have to pay $2,800 for the $4,000 in medical charges after insurance coverage, according to the provided reference table showing figures for insurance payment and amount not covered.
Step-by-step explanation:
The student's question is asking how much Lu will have to pay for $4,000 in medical charges after insurance coverage.
Looking at the provided information, which appears to be a series of insurance coverage scenarios at different price points, the relevant line for $4,000 shows three figures: $1,200, which is likely the insurance payment, and $2,800, which is probably the amount not covered by insurance.
Since the amount not covered by insurance is $2,800, this is the amount Lu would be responsible to pay after insurance coverage. Therefore, the correct answer to the question is not specifically listed in the multiple-choice options given, indicating a possible error in the question or answer choices.