This Patient's X-Ray Revealed "Subchondral Cysts, Subchondral Sclerosis, Joint Space

This patient's x-ray revealed "subchondral cysts, subchondral sclerosis, joint space narrowing": Physical Exam:
RR: 16; HR: 70; Temp: 98.6; BP: 110/60
Gen: Alert, oriented.
CV: RRR, no murmurs.
Resp: CTA.
Musculoskeletal: Crepitation in right knee, decreased ROM. Mild effusion. Mild muscular atrophy of right quadriceps muscle compared to left.
Labs: ESR normal, joint aspiration normal.
X-ray: Subchondral cysts, subchondral sclerosis, joint space narrowing.
Which is the correct translation of "subchondral sclerosis"?

A) sub (bad) + chondr (bone) + al (condition) + sclerosis (hardening condition) = bad bone hardening condition
B) sub (beneath) + chondr (cartilage) + al (pertaining to) + sclerosis (hardening condition) = hardening condition beneath the cartilage
C) sub (good) + chondr (joint) + al (condition) + sclerosis (hardening condition) = good joints that are beginning to harden
D) sub (out) + chondr (movement) + al (pertaining to) + sclerosis (softening condition) = pertaining to movement outside the range of motion
E) sub (upon) + chondr (muscle) + al (condition) + sclerosis (softening condition) = muscle tissue upon the bone is beginning to soften