Final answer:
The grantor defends the title to the grantee against all others' lawful claims with a warranty.
Step-by-step explanation:
The correct answer to the question is a. Warranty. The grantor defends the title to the grantee against all others' lawful claims. A warranty is a guarantee made by the grantor that they have good title to the property and will defend it against any lawful claims by third parties.
For example, if someone sells a house with a warranty deed, they are essentially saying that they guarantee they have the legal right to sell the property and will defend the buyer against any claims to the title made by others.
It is important to note that a warranty is different from other terms listed in the question. Quiet enjoyment refers to the right of the grantee to peacefully possess and use the property without interference. Further assurances refer to the grantor's obligation to take any necessary actions to perfect or clear the title. The covenant against encumbrances refers to the guarantee that the property is free from any liens or encumbrances.