题目内容：
According to the passage, why do people have difficulty snapping negative loops of thinking?[A] Because trying to think about something new in the brain is more difficult than keeping a built path.
[B] Because having the passive thoughts in the brain is much easier than having the positive thoughts.
[C] Because negative thoughts grow in strength much easily.
[D] Because negative thoughts form a easier connection in the brain.
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答案解析：