The correct answer is 'Splitting each line at commas and selecting the third element of the resulting list', because a CSV file is essentially a text file containing data where each line represents a row of data, and each value within that row is separated by a comma. By splitting a line of text at each comma, you create a list where each element correlates to a value in the CSV row. Since the email address is the third value, you would select the third element in the list (often indexed as [2] since most programming languages use zero-based indexing).