Ans: B
Since $R$ is the $y$ intercept of the graph, then the $x$ coordinates of $R$ is $0$.
Since $R$ is the $y$ intercept of the graph, then the $x$ coordinates of $R$ is $0$.
Substitute $x=0$ into the equation of the graph, we have
$\begin{array}{rcl}
y & = & 7^{-0} \\
& = & 1
\end{array}$
Therefore, the coordinates of $R$ are $(0,1)$.
