The sentence indicates that the subject, "Raman" can speak multiple languages viz. Telugu, Marathi and English.
Option A: The phrase, "as well as" means: In addition to. It also means: With equally good result. "Raman can speak Telugu as well as Marathi and English" means: Raman can speak all the three languages. Hence, option A is correct.
Option B" The word, "with" is a preposition which means: Accompanied by something/ someone. It is not appropriate for the given context.Hence, this option is incorrect.
Option C: The word, "beside" is a preposition which means: At the side of/ next to. It is not appropriate for the given sentence. Hence, this option is incorrect.
Option D: The word, "alongside" is a preposition which means: Next to. An example of its usage is: "The motorbike was parked alongside the car. This wordis not appropriate for the given sentence. Hence, this option is incorrect.