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

even if the bill is late, the date in the upper-right corner must be entered in the database. if the date of entry is accidentally entered instead of the bill date, the accounting department will not be able to write a check for the bill. according to starla, the department manager, the date is essential for tracking and paying bills.

a.
by order of importance

b.
point by point

c.
subject by subject

d.
by chronological order