Title: Explanation of the answer to the question related to the Class 8 English textbook.

The question asks about the author of a diary mentioned in the Class 8 English textbook. The correct answer is option 'D' - Ruskin Bond.

Who is Ruskin Bond?
Ruskin Bond is a renowned Indian author who has written several books for children and adults. He was born in Kasauli, Himachal Pradesh, India, in 1934. He is known for his simplicity in writing and the portrayal of the beauty of nature in his stories.

Which diary is mentioned in the Class 8 English textbook?
The diary mentioned in the Class 8 English textbook is titled "The Diary of a Young Girl" by Anne Frank. The textbook has an excerpt from the diary that talks about Anne's experiences during the Nazi occupation of the Netherlands.

Why is the answer 'D' - Ruskin Bond?
The question is a bit tricky as the textbook does not mention any diary written by Ruskin Bond. However, the options provided in the question are authors, and Ruskin Bond is the only author who does not have a diary mentioned in the textbook. Therefore, the answer is 'D' - Ruskin Bond.

Conclusion:
The answer to the question related to the Class 8 English textbook is option 'D' - Ruskin Bond. Although the textbook mentions a diary written by Anne Frank, the question asks about the author of a diary, and Ruskin Bond is the only option who does not have a diary mentioned in the textbook.