Option A is the correct answer because 'talk back' means 'to answer back in a disrespectful manner. Thus, option A is the right meaning for the given idiom.
Option B is incorrect because 'talk behind a person's back' means 'backstabbing'. Thus, option B is not the appropriate meaning for the given idiom.
Option C is incorrect because 'talk in a loud voice' means 'to shout, yell or scream', which is not a good habit, but one may not always intend to be disrespectful or rude by talking loudly. Thus, option C is not the appropriate meaning for the given idiom.
Option D is incorrect because 'reply to the questions asked means 'to respond'. Thus, option D is not the appropriate meaning for the given idiom.