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 $\mathrm{O}$ 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 $\mathrm{O}$ is___________
(A) 8: 23
(B) 23: 8
(C) 23: 31
(D) 31: 23