Choose the best response.

In a letter to the Municipal Commissioner, how will you thank them in advance for the action they will take in response to your complaint?

Formal letters are written to ask authorization or request commodity from a advanced authority. It's veritably important to follow the letter format. It's necessary to use simple and direct language. 
Let’s look at our options one by one 
a) thank you for your attention in this matter- This is an illustration of sanctioned language. This is the kind of language that's supposed to be used in a formal letter. It's a simple language that's brief, direct, and regardful. It contains no informal words. So, it's the correct option. 
b) thanks for doing commodity about it- The word ‘ thanks ’ is an informal word. In formal letters, this kind of language is discouraged, because it isn't an illustration of formal and sanctioned language. So, this is an incorrect option. 
c) I ’m thankful that you'll do the needful- This judgment is presumptuous in its nature. This language, though functionary, is wrong. So, this option is incorrect. 
d) thanks in advance for your unborn bid on the same- This judgment doesn't contain simple language. It's a veritably wordy judgment , which may not inescapably contain sanctioned language. Formal letters must have language that's brief and simple. So, this is an incorrect option.