Gavin measured the temperature every 3 hours from 6:00 am to 3:00 pm.
\begin{array} {|l|c|c|c|c|}
\hline
\rule{0pt}{2.5ex} \text{Time of the day} \rule[-1ex]{0pt}{0pt} & \text{6:00 am}& \text{9:00 am} & \text{12:00 pm} & \text{3:00 pm} \\
\hline
\rule{0pt}{2.5ex} \text{Temperature (°C)} \rule[-1ex]{0pt}{0pt} & 22&28&32&29 \\
\hline
\end{array}
Which graph shows Gavin's results?
A. | B. | C. | D. |