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                        If r is a rational number and s is an irrational number, then which one of the following is true?             

A)  \[(r+s)(r-s)\]       will always be an irrational number.

B)  \[\frac{(r+s)}{(r-s)}\] will always be a rational number.

C)  rs will always be an irrational number.

D)  \[\frac{r}{s}\]

E)  None of these