Final answer:
Hypostasis causes post-mortem extravascular blood discoloration. Correct option is B.
Step-by-step explanation:
The correct answer is B) Hypostasis. Hypostasis, also known as lividity, is the settling of blood in the lower parts of the body after death. It causes a discoloration of the skin and tissues in those dependent areas.
This occurs due to gravity pulling the blood down and causing it to pool.