If you are having problems reading difficult material you can talk to a teacher, reading specialist or even a tutor, so that all of the options are correct. Answer D.
First of all to read difficult material, concentration are organizations are fundamental steps. You should practice the look-away method; make connections and associations, look up words, organize your ideas by the use of conector to link them. However, if you find these tasks a bit tough, you should ask for help, so that you may talk to your teacher or tutor or even a reading specialist who could provide you some items to follow.