Answer:
The correct answer is A. inflammation
Explanation:
Inflammation is the defense mechanism of the immune system which is non-specific and part of the innate immunity of the body. Inflammation is the reaction against any cell injury.
Inflammation is categorized by heat, pain, redness(erythema), and swelling(edema). These changes occur because of the result of the increase in local blood vessel diameter which leads to increase of flow of blood that results in heat and redness.
The transport of fluids and proteins takes place at the injury site which causes swelling and pain. Therefore the right answer is A. inflammation.