A.The reasons why piracy flourishes are two.
B. The problem is not with the laws but with enforcement.
C. Somehow they still do not realize the seriousness of the crime or its economic ramifications.
D. I have been a part of a drive against copyright theft for over two decades now.
E. The first is the lack of awareness amongst the enforcement agencies.
The correct option will be option 3. After reading the sentences, it should be clear that AE should definitely come after each other because they form a pair. There are two options which suffice this i.e. 2 and 3. Now, starting with D helps to locate the topic on which these lines have been written i.e. copyright theft and A states the reason.