The correct answer is <B>option 5, i.e., A.

To derive the SIXTH sentence of the correct arrangement, it is imperative to find out the first five sentences of the correct arrangement.
From the above solutions, we have been able to derive B as the first sentence, as per the question, 2 as the second sentence, E as the third sentence, D as the fourth sentence and 5 as the fifth sentence (PROVIDED by the question) of the arrangement.
At this point, we are able to derive that the first five sentences of the correct arrangement are B2ED5. 
To form the 6th sentence of the right arrangement, we are LEFT with A and C. While A further adds to Mr Howard's statement about the report, C further tells us that Australian Greens and Democrats have grabbed on a report about an actual meeting between the two countries in New Delhi. This tells us that clearly A is followed by C, making A as the fifth sentence of the arrangement.
Also, A completes Mr HOward's statement. Therefore, 5 is followed by A. 
At this point, we are able to derive that the first six sentences of the correct arrangement are B2ED5A. 
Hence, A or option 5 forms the right answer.