Answer:
Inside address.
Step-by-step explanation:
A business letter can be defined as a letter used to send from one organization to the other, or from organization to it's clients, customers, etc. Such letters are formal in writing and uses specific format for writing.
The term used to describe the address of the recipient of a business letter is inside address, also known as recipient's address. The inside address is the information of the receiver of the letter, such as full name and full address, which will help the post to reach the recipient. The inside address appears two lines below the date and on left side of the page. The name should be addressed using personal title such as Mr, Mrs, Ms, Miss, etc.
Therefore, the correct answer is option C, inside address.