Institution: বরিশাল বিশ্ববিদ্যালয় Exam: খ ইউনিট || বরিশাল বিশ্ববিদ্যালয় || 2014
Topic: Correction (Sentence Correction), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The sentence "Bangladesh is famous for her natural beauty" states what Bangladesh is known for, specifically highlighting "natural beauty" as the subject of its fame. To form a corresponding question that elicits this information, we typically structure it to inquire about a particular quality or attribute associated with Bangladesh.

Option **C: "What is Bangladesh famous for?"** is grammatically correct and effectively seeks to identify the specific aspect of Bangladesh that contributes to its fame. The structure is straightforward, using "what" to request information about the noun phrase stated in the original sentence.

Examining the other options:

- **A: "What is for Bangladesh famous?"** is incorrect due to its awkward structure and misplaced words, making it nonsensical.
- **B: "Why is Bangladesh famous for?"** asks for a reason rather than the subject of fame, resulting in incomplete thought since it lacks an object at the end.
- **D: "For what is Bangladesh famous?"** while grammatically correct, sounds overly formal and less natural than Option C.

Thus, Option C is not only grammatically correct but also captures the essence of the information being sought, making it the best choice.