Decreased gastric production of hydrochloric acid and the resulting shortage of the intrinsic factor cause:
a. rheumatoid arthritis.
b. systemic lupus erythematosus.
c. pernicious anemia.
d. autoimmune hemolytic anemia.

C. Penicious anaemia

Explanation: Penicious anaemia is a disease caused by the bodies inability to make enough vitamin B-12 required to produce healthy red blood cells,it is a very rear disease with a 0.1% prevalence in the population,it has a higher of approximately 2% prevalence among the older members of the population especially those above 60years old according to a 2012 medicine study.

The symptoms of this disease include weight loss, memory loss,loss of appetite,heart burn etc

It can be treated with vitamin B-12 drugs or injections,it can be prevented by taking enough foods like Meats, shellfish,eggs, poultry products and vitamin B-12 supplements.

a chemical reaction

explanation:

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.