If a and b are positive integers and (a - b)/3.5 = 4/7 , then:

Answer: Option B

$$\frac{(a-b)}{3.5}$$ = $$\frac{4}{7}$$
⇒ (a - b) = $$\frac{4}{7}$$ × $$\frac{7}{2}$$ = 2
⇒ b < a