What happens next in this paragraph?

How to buy an exercise ball
Choose an extra-small ball if you are up to 5' (152.4 cm) tall.
Exercise balls are available in different sizes, based on the diameter of the ball when fully inflated. The correct ball size is selected based on your height.
Pick your answer from:
(a). Incorporate more commonly used materials for maximum capacity and dimension when shopping for a new exercise ball. Purchase an inexpensive exercise ball if you are taller than 5'2 " (16..
(b). For example, if you are 5'2 " (122.4 cm) tall and weigh 152.4 lb, you'll need a heavy ball. If you are 5'4 " (122.4 cm) tall and weigh 152.4 lb, you'll need a small ball..
(c). So if you are under 5', the extra-small ball with a diameter of 45 cm (17. 7 in) will probably work best for you..
(d). Consult a physical or hobby store if you are concerned about what size ball to buy. Pull the ball to your belly to inflate it..
(c).