The answer is B) particulate matter
I would say the first and the last choices
You are very smart, that is a fascinating question
Answer:
Just put what you believe from this info
Explanation:
The Black Death is estimated to have killed 30% to 60% of Europe's population. In total, the plague may have reduced the world population from an estimated 475 million to 350–375 million in the 14th century.
I think he is applying the principle of adaptation