Directions: In each of the questions given below, four words are given in bold. These four words may or may not be in their correct positions. The sentence is then followed by options with the correct combination of words that should replace each other in order to make the sentence grammatically and contextually correct. Find the correct combination of words that replace each other. If the sentence is correct as it is, select '5' as your option. 

An discover (A) was what led Newton to apple (B) a truth that changed (C) the path of physics and made him immortal. (D)