To determine a reasonable scale for the y-axis representing Sariyah's earnings based on her hourly wage and work hours, we can calculate her maximum potential earnings. If she works the maximum of 20 hours at $8 per hour, her earnings would be:
\[ 20 , \text{hours} \times 8 , \text{dollars/hour} = 160 , \text{dollars} \]
Given that her earnings will range from $0 (if she works 0 hours) to $160 (if she works 20 hours), a reasonable y-axis scale would be 0 to 200.
Thus, the correct choice is: 0 to 200.