The correct answer is: Only assumption II is implicit.
The statement provides information about the multinational fast food chains opening up a large number of Plus Coffee Shops with piped modern music in different cities of India and serving various breakfast (snax) with coffee. However, it does not provide any information about the number of people who will become regular customers of these coffee shops or whether they will enjoy the comfortable environment while drinking coffee with snax. Therefore, only assumption II is implicit.
Assumption I is not implicit because the statement does not provide any information about the number of people who will become regular customers of these coffee shops. It is possible that a large number of people will become regular customers, but it is also possible that only a small number of people will become regular customers.
Assumption II is implicit because the statement provides information about the comfortable environment of the coffee shops. It is likely that people will enjoy the comfortable environment while drinking coffee with snax.