Question

write a letter to the editor of national daily regarding wastage of water​

Answer 1

Answer:

is both a formal and a personal-business letter as we can understand from the given context. It is formal because the tone of the sentence suggests it and as the person writing the letter is making a personal request to the receiver to replace something, it is a personal-business letter as well. Hence options A and D are the correct answers.

Options B and C are incorrect because the letter is from someone who is in a position of authority making a personal request for the replacement and hence cannot be a semi-formal or informal letter.