All of the Following Are Covered Under the Building and Personal

All of the following are covered under the building and personal property coverage form EXCEPT

A) the insured's stock and inventory when located inside the insured building.
B) equipment used to service the insured building.
C) the insured's use interest in improvements and betterments if the insured is a tenant.
D) a manufacturing building owned by a key customer or key supplier of the insured.