Trey only correctly represented the asymptote. Option A is the right choice.
Trey's graph:
The y-axis goes from 20 to 140.
The x-axis goes from 20 to 23.
The dashed line is horizontal at y = 100.
Ricky's graph:
The y-axis goes from 20 to 140.
The x-axis goes from 20 to 23.
The dashed line slants upwards from left to right, starting at y = 40 at x = 20 and ending at y = 120 at x = 23.
The correct asymptote for an exponential function is a horizontal line that the graph approaches but never touches, as the x-values approach positive or negative infinity.
Trey's graph correctly shows the asymptote as a horizontal line at y = 100.
Ricky's graph incorrectly shows the asymptote as a slanted line.
Option A is the right choice.