The following figure shows the data of students enrolled in 5 years $(2014$ to 2018$)$ for two schools $\mathrm{P}$ and $\mathrm{Q}$. During this period, the ratio of the average number of the students enrolled in school $\mathrm{P}$ to the average of the difference of the number of students enrolled in schools $\mathrm{P}$ and $\mathrm{Q}$ is___________________

(A) 8: 23

(B) 23: 8

(C) 23: 31

(D) 31: 23

The following figure shows the data of students enrolled in 5 years $(2014$ to 2018$)$ for two schools $\mathrm{P}$ and $\mathrm{Q}$. During this period, the ratio of the average number of the students enrolled in school $\mathrm{P}$ to the average of the difference of the number of students enrolled in schools $\mathrm{P}$ and $\mathrm{Q}$ is___________________

(A) 8: 23

(B) 23: 8

(C) 23: 31

(D) 31: 23

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