Which change, if any, is needed to the underlined text? It might be helpful to first consider the Western calendar which is also called the Gregorian calendar. It might be helpful to, first, consider the Western calendar which is also called, the Gregorian calendar. It might be helpful to first consider the Western calendar, which is also called the Gregorian calendar. It might be, helpful, to first consider the Western calendar, which is also called the Gregorian calendar. No change