HELP IM TAKING A TEST

Living things have been organized into different categories to make it easier to identify them. Below is a diagram that represents part of the organizational structure of living things. What does the broadest part label X represent?
choices

1.Domain

2.Kingdom

3.Order

4.Species

HELP IM TAKING A TEST Living things have been organized into different categories to make it easier to identify them Below is a diagram that represents part of class=