The correct option is B bunch
Look, Mother; James has brought you a 'bunch' of flowers.
It goes without saying that nobody is going to present a branch, bush, bucket or growth of flowers, unless the situation is extremely comical. 'Bunch' is a collective noun used to refer to things such as 'flowers' or 'keys.'
So, option C is correct and the other options are not because they do not provide the correct answer.