Welcome to the forum. There is nothing wrong with ‘will be talking’ in your sentence. ‘Will talk’ is the factual description. ‘Will be talking’ suggests that this is going to happen and probably that this is what you want to know as it may answer some of your questions.
As Alan says, it could be either. There is no context to indicate which verb form is more appropriate, so choose the simpler verb form - (Simple) Future.
Where did you find that test question, Gsandhya?
Was it online (in which case perhaps you could give us a link to see if there is a reason for using ‘will be talking’) or in a book?
thanks for replying alan , bazza and beeesneees…i thought will be talking would fit in there…i was taking a grammer test in tcyonline.com and found it in there verb usage test…