Answer
B. The average temperature, which is 33.25 °C
Step-by-step explanation
The average between two values is computed as follows:
[tex]average=\frac{value\text{ 1 + value 2}}{2}[/tex]In this case, we need to calculate the average between 31.5 °C and 35 °C, then:
[tex]\begin{gathered} average\text{ temperature = }\frac{31.5+35}{2} \\ average\text{ temperature=}\frac{\text{66.5}}{\text{2}} \\ average\text{ temperature=33.25 \degree C} \end{gathered}[/tex]