The domain of the graph is
A. All positive real numbers less that 160
How to find the domain
The domain refers to numbers or values that are in the x-axis. These numbers are sometimes referred to as the input values.
Examining the graph, we can deduce that the x-values started from 0 to 160.
These numbers are on the positive sides. Hence the numbers are referred to as positive real numbers.
The option that defiens the doamin is A