Answer:
Option B is correct
[tex]C = \pi d[/tex]
Step-by-step explanation:
Direct variation states that:
if [tex]y \propto x[/tex]
then the equation is in the form of:
[tex]y=kx[/tex] where, k is the constant of variation.
As per the statement:
The circumference(C) of a circle is equal to pi times the diameter(d).
then:
[tex]C = \pi \times d[/tex]
⇒[tex]C = \pi d[/tex]
Therefore, the direct variation equation represents this situation is, [tex]C = \pi d[/tex]
