An inflammatory condition that occurs in a vein because of blood pooling from inactivity or prolonged standing and that results in swelling, redness and pain is konwn as:

Phlebitis

Explanation:

Phlebitis is a condition involving the inflammation of the vein. This occurs due to prolonged inactivity that is staying in the bed or sitting for long hours or due to prolonged standing. This causes stagnant or slow flow of blood from the legs due to the body alignment in the dependent position. The pooling of the blood in the legs leads to formation of clots or thrombus. This condition involves pain, redness and swelling.

b and c would be the answers