How can i force myself to concentrate more on studying? ? any ideas? ?

If you have a dream, if you know what you wanna do when you grow up and when you get to the college, if you like to go to a specific college,
and if you have anything that you wanna have, catch it and be yours,
the only way is to do not waste your time... if you don`t use your time now it will be gone and never will come back High school is the best age to study, to catch your dreams, to find what you want from your life, your future
Time is an important thing that if you don`t use it NOW you can never use it... it will be GONE.
Study is hard... also catching the dreams but this is your mountain... you can climb up and see the prettiest view that is under your feet or fall down and  act happy and do not care
This is your life... if you want it then do it... you are able to do ANYTHING YOU WANT just want it 
dont waste your time, have a dream, catch it even is the hardest thing to do :
i hope this is helpful
have a nice day

Listen to some music some times it help or go outside and listen to the world it help you relaxed and focused

Ibelieve the answer is c.