Guaranteed replacement cost is designed to protect the insured when the actual cost to rebuild exceeds the stated dwelling limit, but it is not unconditional. The insured must normally insure the dwelling to the full replacement cost value established at the last accepted valuation and comply with policy requirements, including reporting material improvements or changes within the required time. Option A is correct because the building was insured to 100 percent of replacement cost at the last valuation, satisfying the core insurance-to-value requirement. Option B is incorrect because notification 115 days after improvements would likely exceed common reporting requirements and could jeopardize the guarantee. Option C is wrong because a change in occupancy may be a material change and is not a basis for automatic unlimited rebuilding payment. Option D is incorrect because 85 percent of replacement cost is underinsurance for a guaranteed replacement cost provision requiring full insurance to value. Brokers must explain these conditions clearly; clients often wrongly assume “guaranteed” means unlimited coverage without obligations. References/topics: Property Insurance—Wordings; guaranteed replacement cost, insurance to value, valuation updates, dwelling limits.