Final answer:
The term 'The Magnificent Obsessions' refers to things that one is incredibly passionate about and feels compelled to pursue, making option B) 'You've just got to do' the correct answer.
Step-by-step explanation:
The term 'The Magnificent Obsessions' refers to things or pursuits that one is incredibly passionate about. In the context of the options provided, the most appropriate answer to the phrase “The Magnificent Obsessions are the ones that you feel” would be option B) ‘You’ve just got to do. This implies that these are passions or aspirations so strong that they compel you to act upon them. They aren't just idle daydreams (option A), they don't make you feel bad (option C), and they definitely are not things that you feel indifferent or 'blah' about (option D).