When $\mathop a\limits^x U$ is converted into $\mathop b\limits^y P$,which of the following represents the correct decrease in the number of neutrons?
- A$(x-a) - (y-b)$
- B$(x-a) + (y-b)$
- C$(x+a) - (y+b)$
- D$(x-a) - (y+b)$
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