I believe that the correct answer is D.)Animal Species
Animals reproduce , breed , and affect the agriculture.
Look up the word agriculture , you will see how my answer makes more sense.
My reason being is mainly because everything basically lives off of animals and if the are affected by anything and in any way start to decrease , the population will also.
I really hope that this helps you out a lot.
A/ Soviet Union is the answer
During the Middle Ages, books were extremely elaborate in Europe. While other civilizations had used easily accessible materials and formats to create their scrolls, books or tablets, Europeans during the Middle Ages spent a great deal of time and money making books. These were bound in leather, decorated with elaborate drawings, and copied by hand in elaborate scripts.
This had a very important effect on European society. It meant that books were not available for the vast majority of the population. It also meant that books were difficult to find and very expensive to acquire. Finally, it also meant that only a very small group of people could read, and these were usually wealthy men and monks.
I believe it’s is A! Hopefully this helped ❤️