I only photographed my textbook but this page gives a lot of information about your question
Answer:
Correct answer is 2. The percentage of Christians dropped from 95% to 70%
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Explanation:
First option is not correct as Islam wasn't majority in religion in Europe. Protestants, Catholic and Orthodox were and are still majority.
Second option is correct mostly due to fact that many communist regimes were established and the number of believers lowered.
Third option is not correct as although many Jews were killed during WW2, and some left Europe, there are still some who were living mostly in Eastern Europe.
Fourth option is not correct as these two churches never reunited since they were separated in 16th Century.
The number of people per square mile is the population density
