Which of the following two variables likely to have maximum positive correlation coefficient ?

A

$$ \begin{cases}x=the  annual  salary \\y=the  annual  savings\end{cases}$$

B

$$\begin{cases}x=Air  fares\\y=Air  passengers\end{cases}$$

C

$$\begin{cases}x=The  cost  of  health  care\\y=the  number  patients\end{cases}$$

D

$$\begin{cases}x=Cost  of  railway  platform  tickets\\y=Passengers  on  the  railway   platform\end{cases}$$