wAnswer: D. All of the above
Explanation: Although the Great Famine of 1315 was 30 years before the black death that started in 1347, lack of food was a common problem in that era. The common medical practices of the day were blood letting and boil lancing - both of which were not good nor sanitary. And that was only if you could get a doctor to look at you if you had the disease. The trading that was going on in those days allowed diseases to travel great distances and therefore affect larger numbers of people. This is no different than the influenza of 1918 and Covid-19 epidemics.