Question 324634
If 0 < st < 1, which of the following can be true? 
A. s < -1 and t > 0 
Can't be true, {{{st<0}}}
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B. s < -1 and t < -1 
Can't be true, {{{st>1}}}
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C. s > -1 and t < -1 
Can be true, only need 1 example, {{{s=-1/2}}}, {{{t=1/2}}}, {{{st=1/4}}}
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D. s > 1 and t < -1 
Can't be true, {{{st<0}}}
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E. s > 1 and t > 1
Can't be true, {{{st>1}}}
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Looks like C) is the only answer.