The correct option is B Mule
Mule is the offspring of a male donkey and a female horse (mare). Mules are more patient, sure-footed, hardy and long-lived than horses, and they are considered less obstinate, faster, and more intelligent than donkeys. Army uses two type of mule (i) General service type and (ii) Mountain artillery type. They are used by armies to transport supplies, occasionally as mobile firing platforms for smaller cannons, and to pull heavier field guns with wheels over mountainous trails. Hence, option B is correct.