A. arthro (joint) + dys (not) + plasia (structure) = bad joint structure
B. arthro (joint) + dys (against) + plasia (formation) = against joint formation (an agent preventing joint formation)
C. arthro (joint) + dys (bad) + plasia (formation) = bad joint formation (abnormal joint development)
D. arthro (joint) + dys (together) + plasia (structure) = a joint properly in place
E. arthro (joint) + dys (out) + plasia (structure) = a joint that is out of place