9. If the line $y = k x - 2$ is tangent to the curve $y = 1 + 3 \ln x$, then $k =$ A. $2$ B. $\frac { 1 } { 3 }$ C. $3$ D. $\frac { 1 } { 2 }$
Let $S _ { n }$ denote the sum of the first $n$ terms of an arithmetic sequence $\left\{ a _ { n } \right\}$. Given $S _ { 4 } = 0$,
9. If the line $y = k x - 2$ is tangent to the curve $y = 1 + 3 \ln x$, then $k =$\\
A. $2$ \quad B. $\frac { 1 } { 3 }$\\
C. $3$ \quad D. $\frac { 1 } { 2 }$