The correct option is A as
The given sentence is about different holiday destinations. To introduce the examples or the types of a particular banner, we pair 'as' with 'such' and create the idiom or phrase 'such as'. Here, Darjeeling and Digha are examples of holiday destinations in West Bengal. Hence option A is correct. 'That' when paired with 'such' refers to an extent of something as in 'It was such an interesting story that I finished reading it in one sitting'. It does not refer to an example. Hence, option B is incorrect. 'If' refers to a condition, a hypothetical situation that may or may not be true as in 'I'll go if you come with me'. There isn't any hypothetical situation here, and 'if' doesn't pair up with 'such' as they have different meanings, hence option C is incorrect. 'Or' is used to present a choice between two things 'this or that'. There isn't a choice between the hobbies in this sentence, hence it can't be paired with 'such' and option D is incorrect.