Ans: C
Without loss of generality, suppose $a=2$, $b=4$ and $c=0.25$.
Without loss of generality, suppose $a=2$, $b=4$ and $c=0.25$.
I must be false. $b>a$.
II must be true. $b >c$.
III must be true. $a>1$.
IV must be false. $c<1$.
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