If we observe the sentences,

C-B and A-D-E form a pair and a block of sentences, respectively.

Sentence C-B forms: "Blissfully unaware of the tragic events in Ayodhya,"

Sentence A-D-E forms: "Sita and Ram walk through the forest with great gaiety."

The pair C-B would be the introductory part. Starting with "Blissfully unaware of the tragic events in Ayodhya," (C, B) creates a dependent clause that sets the context, followed by the main clause "Sita and Ram walk through the forest with great gaiety" (A, D, E). The comma in sentence B separates the introductory clause from the main clause, providing grammatical flow.

If we check the other possibility, ADECB is also meaningful, but the placement of the comma in sentence B ("the tragic events in Ayodhya ,") creates a problem. The trailing comma in B makes it less grammatically correct in this arrangement.

Therefore, Option a) C, B, A, D, E is the correct sequence.