Please help me ASAP I'm in the quiz rn! Read the following paragraph.

Writing is difficult because so many skills are involved. We must spell and form words correctly, and we must arrange sentences clearly. We must construct paragraphs logically, and we must pull paragraphs together so that they work to form a unified piece of writing. All these skills require frequent review, careful examination, and practice.

What type of expository structure was used for this paragraph?

classification/division
cause/effect
process analysis
comparison/contrast
definition
illustration/ example