Respuesta :
Answer:
The correct answer is the option C: Dear Mr. Patel:
Explanation:
When writing a formal letter, its differences from an informal letter are mainly in the way of the structure and the words used. A formal letter is generally addressed to a person that is either not known personally for the writer or a superior. Therefore it is strongly recommended that when writing a formal letter the correct way to salute is to write ''Dear Mr/Mrs'' and the name of the person if it is known, understood as a way to speak directly and also politely to the person who the letter is addressed to.