How is the following passage from a cause-and-effect essay organized?

The greenhouse gas theory states that, in normal conditions, sunlight warms the earth during the day. Then, at night the earth cools down. However, over the years, gases such as carbon dioxide have been released into the atmosphere. Now, those gases trap the heat that the earth would have cast off before.


A.
subject by subject




B.
point by point




C.
by order of importance




D.
by chronological order