# Free GRE Practice Questions

Question 1 of 1
ID: GRE-SMQ-4
Section: Quantitative Reasoning - Multiple Choice with one or more answer
Topics: Number Properties; Absolute Numbers; Fractions
Difficulty level: Hard

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If $ab>cd$, and none of $a$, $b$, $c$, and $d$ is equal to 0, which of the following must be true?

A$-ab
B$|ab|>|cd|$
C$ba
D$-ab<-cd$