In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives._x005F_x000D_ Â _x005F_x000D_ Left to itself, then, attention _____________ obeys natural laws and follows the line of least resistance. _______________ far the larger portion of our attention is of this type. Thought often runs on hour after hour when we are neither conscious of effort _____________ struggle to compel us to cease thinking about this thing and begin thinking about _________. Indeed, it may be doubted ___________ this is not the case with some persons for days at a time, instead of hours. The things that present themselves to the mind are the things which occupy it; the character of the thought is determined by the character of our interests._x005F_x000D_ Â _x005F_x000D_ conscious of effort _____________ struggle to compel_x005F_x000D_

• A. no_x005F_x000D_
• B. not_x005F_x000D_
• C. none
• D. nor