A vehicle, moving with a speed of y km/hr, covers x km in z hours. Which of the following is correct in respect of the statement above?

• A. \(y \propto \frac{1}{z}\) (x is constant)
• B. y ∝ x (z is constant)
• C. z ∝ x (y is constant)
• D. y ∝ z (x is constant)