Institution: জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় (JKKNIU) Exam: খ ইউনিট || জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় || 2012
Topic: Miscellaneous (Others Question of English Grammer), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The body of a letter is the most important part because it conveys the primary message, purpose, and content of the correspondence. While the addresses of both the recipient and the writer provide essential contextual information, they do not communicate the actual intent of the correspondence. The body contains the essential details, thoughts, and emotions that the writer wishes to express, making it the core of the letter.

In any form of written communication, the ultimate goal is to exchange ideas or information. Without the body, a letter would simply be an empty shell lacking substance. Additionally, the body serves to establish the tone of the message, whether it be formal, informal, persuasive, or informative. It allows the writer to articulate their thoughts clearly and effectively, ensuring that the recipient understands the intended message.

While other elements such as the signature can lend authenticity and personal touch to a letter, it is the body that truly delivers the message, making it the heart of the written communication. Thus, option C, the body of the letter, is understandably the most crucial component.