Answer:
<h2><em><u>C</u></em><em><u>.</u></em><em><u> </u></em><em><u>0</u></em><em><u> </u></em></h2>
Step-by-step explanation:
As,
In a constant term the power of the variable is zero, so it's degree is 0.
<em><u>Eg</u></em><em><u>:</u></em>

<em><u>Since</u></em><em><u>,</u></em>
<em><u>
</u></em>
<em><u>Hence</u></em><em><u>,</u></em>
4 × 1 = 4
<em><u>Here, The value remains unchanged hence it is the constant variable. </u></em>