A patient with rheumatoid arthritis presented with swelling of both legs

A 48-year-old woman with rheumatoid arthritis diagnosed at age of 24 , presented with progressive lower limbs edema.
Which ONE of the following may best explain this?
A- Ruptured Baker's cyst
B- Amyloidosis
C- Bursitis
D- Felty's syndrome
E- Coronary vasculitis