Read the passage.

As many as one half of all middle school students say they have trouble getting to class on time. It is difficult to move through the crowded halls to get from class to class, and students are expected to use the restroom or meet with their school counselors during this time. One way to fix this issue is to add one more minute to the breaks between classes.

Which organizational structure does the writer use in this passage?

a
compare and contrast
b
sequence and summary
c
cause and effect
d
problem and solution