The correct order to form a meaningful sentence is CBADE. Part C comes first as it introduces the subject of the sentence, which is the new recycling program. Part B specifies the purpose or reason for the introduction of the new recycling program. Accordingly, CB forms a logical pair. Part A specifies the actions or goals associated with the program, which are to reduce waste and promote something. Part D specifies what is being promoted (environmental sustainability) or aimed for through the actions of the recycling program. Part E specifies the scope or context in which the actions of the recycling program are intended to take place. Hence, (a) is the correct answer.
The complete sentence is: The new recycling program was introduced as a means to reduce waste and promote environmental sustainability within the community.