If \(m, p, s\) and \(v\) are positive, and \(\dfrac{m}{p}< \dfrac{s}{v},\) which of the following must be between \(\dfrac{m}{p}\) and \(\dfrac{s}{v}?\)
I. \(\dfrac{m+s}{p+v}\)
II. \(\dfrac{ms}{pv}\)
III. \(\dfrac{s}{v}-\dfrac{m}{p}\)
A. None
B. I only
C. II only
D. III only
E. I and II both
Answer: B
Source: GMAT Prep