A. Their chests were puffed out like those of pouter penguins and they had battle-ready vigour.
B. After about ten minutes the designated soldiers on each side lowered their flags and the sunset showdown was over for the day.
C. Soldiers on each side marched up to their opposite numbers
D. As the bugles sounded loud and clear, the ceremony began.
E. The crowd on both sides erupted into a frenzy of shouting cheering their own country.

'D' will be the opening statement as it talks about the start of the ceremony.

Similarly, 'B' will be the last statement as it mentions the end.

'C' will follow 'D' as it mentions how the ceremony starts. 'A' will continue the discussion as it talks about the soldiers mentioned in 'C'.

'E' will follow 'A' as it talks about the reaction of the crowd to the display of the soldiers.

Thus, the required sequence becomes D-C-A-E-B.

Hence, the answer is option B.