$2$, $4$, and $6$ are even numbers. Thus, the probability is $\frac37$. 
There is a box containing~$7$ chips numbered $1$, $2$, $3$, $4$, $5$, $6$, and $7$. A chip is drawn randomly from the box. What is the probability that the number on the chip is an even number? (adapted from 2015 AMC 8 Problem, Question \#7) 
A: $\frac17$ 
B: $\frac37$ 
C: $\frac57$ 
D: $\frac47$ 
E: $\frac67$ 