The answer is, "B. The sentence contains no punctuation."
Several necessary punctuations such as periods and commas are missing. After the word position, there should be a period since that is a complete sentence. There should also be a punctuation mark after the word convenience, as well as one after the phone number.
However, the are no misspellings and the style/tone is neither informal nor casual. Therefore, the other choices would be incorrect.
