Answer to Question 1
The following are problems with the item. First, choice a is grammatically inconsistent with the stem. Second, the stem and the correct choice both contain the word collapse, which provides a clue to test-wise students. Third, choice d contains the absolute term all, and fourth, the correct choice is shorter than the distracters.
An example of a more effective item might be:
Communism collapsed in Eastern Europe primarily as a result of a
Answer to Question 2
c