2. In the arithmetic sequence $\left\{ a _ { n } \right\}$, if $a _ { 2 } = 4 , a _ { 4 } = 2$, then $a _ { 6 } =$ A. $-1$ B. $0$ C. $1$ D. $6$
2. In the arithmetic sequence $\left\{ a _ { n } \right\}$, if $a _ { 2 } = 4 , a _ { 4 } = 2$, then $a _ { 6 } =$\\
A. $-1$\\
B. $0$\\
C. $1$\\
D. $6$