Work Step by Step
Start by considering $[-20,80,10]$ along the $x$-axis. From this, we can conclude that the distance between two ticks along the $x$-axis is $10$, and the maximum $x$ value is $80$. Also, with $[-30,70,10]$, we know that the maximum $y$ value is $70$ and the distance is $10$. By counting the ticks visible in the graph along the $x$-axis and $y$-axis, we can eliminate all the other choices and choose b.