I need help please.

For some people, the morning isn’t complete without one, two, or even three cups of coffee. This is probably because caffeine, found in coffee, tea, chocolate, and soda, can increase a person’s alertness and produce a sense of well-being. It also decreases fatigue and boredom. On the other hand, caffeine can be very bad for one’s health, causing insomnia, headaches, nervousness, dizziness, disturbed sleep, and stomach upset. In women, caffeine may aggravate symptoms of PMS and increase their risk of osteoporosis. The selection’s main pattern of organization is: (Click on the pattern of organization.)
a. definition and example. b. comparison.
c. contrast.
d. cause and effect.