LOOK at the meaning of each of the words given:Buoya floating object, fastened to the bottom of the sea or a river, that shows the places where it is dangerous for BOATS to goSpursomething that encourages you to do SOMETHING or that makes something happen more quicklyDeterrencethe action of DISCOURAGING an action or event through instilling doubt or fear of the consequencesExhilarateto make (someone) very happy and excited or elated Thus the correct answer is OPTION 3