If $r$ and $s$ are positive integers and $r-s=6,$ which of the following has the greatest value?

If $r$ and $s$ are positive integers and $r-s=6,$ which of the following has the greatest value?

A. $2r$
B. $2s$
C. $r +s$
D. $2r-s$
E. $2s-r$

Answer: A

Source: GMAT Prep

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