Answer:
d. a penalty clause
Step-by-step explanation:
Penalty clauses are inserted in the contract with the purpose that any of the party shall not breach the contract and shall properly do the act as per the contract.
But penalty clause shall be binding on both the parties, failure of any party shall have a penalty if there is penalty inserted in the contract for any of the party to contract.
Here the contract provides for a penalty clause to penalize the failure of Metro Facilities, and thus, the contract is just providing penalty to Metro Facilities, and thus, not enforceable clause.