Thank you.
Dear Olindalima,
 
�I am not sure which to choose, A or B�.  Please, help me!�
�I am at a loss as to what to buy for my daughter�s birthday.  What do you suggest?  Please, help me!�
�I don�t know which to pick.  I don�t know which to choose, A, B, or C.  Please, help me!�
�I am in a dilemma, because I can�t decide whether to choose A or B.  What do you suggest?  Please, help me!�
�I can�t make up my mind which to choose, A, B, or C.  Please, help me!�
�I am in a quandary, because there are several possible courses of action, and I can�t decide what to do.  Please, help me!�
�What is your opinion?  Which one is right --- this one or that one?  Please, help me!�
�I am undecided which answer/word/sentence/construction is correct.  Please, help me!�
 
�I am in doubt/I am doubtful/I am uncertain/I am undecided/I am confused/ as to how to answer this question�.
�I have doubts/I have my doubts/I have a difficulty/I have a problem/I have a query/I have a question/I have a hesitation/I have an uncertainty/ regarding this situation�.
 
These, and many other phrases, would be suitable.
 
If you wish, PM me, or Skype me, and we can discuss it further.
 
Les Douglas