Umm so here is the deal,
A. Is essentially a restatement of the existing claim and hence when the question asks about further claims that the author has committed himself by the way of the aforementioned statement there is no answer in this statement, because the author clearly implicitly has already committed himself to this claim without any need for further inference.
B. This one while it surely makes sense that yes certain commonly performed actions may not be capable of being considered as morally responsible actions because of the fact that it might be a ingrained habit that the adult has gotten from the time they were an infant, may close attention to the fact that in the second last line the war use is "sometimes ", which implies that it is not a habit that is not a morally responsible action but rather maybe occasional acts, are these occasional act a habit ? we don't know and for that reason this answer choice while tempting is not the correct one.
C. There is no support in the passage for adult who claim that they are not to be held responsible for the treatment they reactive, the premise only stabilises that sometimes the treatment we receive is a consequence of the action the at we have performed and hence there might be a question of our own liability in the case of the treatment that we receive, not this statement talks about the liability of the same, but to establish the liability we have to establish that the actions that the person has performed was under his control. but as we come to know from the passage that might not always be the case hence we can not make any blanket statement as to whether actions by those who state that they have no control would actually be only because of the infant stage.
D. Again this is the same as A, this is a negation of the first statement of the premise and hence is a completely agreed upon idea and not an inference that the author would agree upon.
E. this is the right answer because, every action includes the actions that have been committed because of the fact that the person was indoctrinated a certain way when they were an infant and hence as per the author they should not be held morally responsible for the same.