Why is the careful observation of the key sentence important in identifying the main idea of a paragraph?

After taking notes carefully and studying freqently, derek not only passed the test, select the word group below that best completes the sentence in parallel structure. and he got 100% but he scores well on classwork but he also scored the highest in the class and he was also scoring the best he ever had

Read the excerpt from the land. of my brothers, i was closest with robert. i suppose, in part, being the same year's children made us close, but there were other things too. we had been together practically since birth, and we always took care of each other. when i got into trouble, robert was there to pull me out of it if he could, or at least to see me through it, and i did the same for him. the passage provides evidence of why paul and robert have physical conflicts. paul and robert avoid social conflicts. paul is the least influenced by robert. paul is motivated to ask robert for .

Answer this correctly what is the cause and effect