Journey to the West, Romance of the Three Kingdoms, Water Margin, and Dream of the Red Chamber are treasures of classical Chinese literature, collectively known as the Four Great Classical Novels of China. To understand the reading situation of these four classics among students in a school, a random survey was conducted of 100 students. Among them, 90 students had read either Journey to the West or Dream of the Red Chamber, 80 students had read Dream of the Red Chamber, and 60 students had read both Journey to the West and Dream of the Red Chamber. The estimated value of the ratio of the number of students who have read Journey to the West to the total number of students in the school is A. 0.5 B. 0.6 C. 0.7 D. 0.8
\textit{Journey to the West}, \textit{Romance of the Three Kingdoms}, \textit{Water Margin}, and \textit{Dream of the Red Chamber} are treasures of classical Chinese literature, collectively known as the Four Great Classical Novels of China. To understand the reading situation of these four classics among students in a school, a random survey was conducted of 100 students. Among them, 90 students had read either \textit{Journey to the West} or \textit{Dream of the Red Chamber}, 80 students had read \textit{Dream of the Red Chamber}, and 60 students had read both \textit{Journey to the West} and \textit{Dream of the Red Chamber}. The estimated value of the ratio of the number of students who have read \textit{Journey to the West} to the total number of students in the school is
A. 0.5
B. 0.6
C. 0.7
D. 0.8