Available choices:
A). Having a chair that is too low, too high or too high can lead to back injuries and stiff joints. Consider the seat size and how comfortable you feel in the chair.
B). Some ergonomic chairs require that employees sit straight up at a 90 degree angle to support their shoulders while sitting. Some chairs are taller with a height of 24 to 27 inches.
C). Your chair height will determine how much recommended support you need to get while sitting and standing. But, if you choose chairs that are somewhat elevated or are high on a table, they should not get so high that they irritate or sabotage your back.
D). Ergonomic office chairs should have a height adjustable seat. Not everybody is one size so look for the chairs that have those levers under them that allow for the proper adjustments.Choose from options above and answer: What most naturally follows?

How to select an ergonomic office chair
Understand the importance of having chairs that are ergonomic.
Ergonomic chairs help to reduce back problems, pain in the shoulders and neck and give better support to someone who uses it throughout the whole day.
Check the height.
Answer:
D).