Step 1: Seropositive rheumatoid arthritis means rheumatoid factor (and/or anti-CCP) is present in the blood. These patients have a chronic symmetric inflammatory polyarthritis.
Step 2: Option a is correct - RA is a polyarthritis, typically affecting multiple small joints of the hands and feet.
Step 3: Option b is correct - the joint involvement is characteristically symmetrical (same joints on both sides).
Step 4: Option c is correct - inflammation produces joint pain and swelling, along with morning stiffness, rheumatoid nodules and eventual bone/cartilage erosion on X-ray.
Step 5: Since features a, b and c are all classic of seropositive RA, the answer is option d, All.