Final answer:
The error is in the phrase "the northern most state in America"; it should instead be "the northernmost state in America."
Step-by-step explanation:
The sentence in question is "Alaska the northern most state in America is also the country’s largest state." Upon examination, the error occurs in section B, "the northern most state in America." The correct phrasing should be "the northernmost state in America," combining "northern" and "most" into one word to correctly form the compound adjective. Therefore, the corrected sentence should read: "Alaska, the northernmost state in America, is also the country’s largest state." It is also important to note that the sentence lacks commas that would properly set off the appositive phrase, which should be rectified. Including these commas, the corrected sentence should be: "Alaska, the northernmost state in America, is also the country’s largest state."