If $b \ne 0,$ and $1 - \dfrac{a}{b} > 3,$ which of the following must be true? - The Beat The GMAT Forum

If $b \ne 0,$ and $1 - \dfrac{a}{b} > 3,$ which of the following must be true?

I. $-a > 2b$
II. $a < 0$
III. $\dfrac{a^3}{b^3} < 0$

A. I only
B. II only
C. III only
D. II and III only
E. I, II, and III

Answer: C

Source: Veritas Prep

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