It's B, Warranty Contract.
Master contract is incorrect because it just combines multiple contract records.
https://www.ibm.com/support/pages/distinguishing-contract-types-maximo
Master contract
A way to associate many contract types together for the same vendor and define terms and conditions for the relationship with the vendor. A master contract lists all contracts that you have with a particular vendor. For example, a master contract might list rental contracts for tools or equipment, purchase contracts for materials, a labor rate contract, and a warranty on parts and labor. Master contracts are created in the Master Contracts application.
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