How many feet/foot would be equal to $36$ inches?

The correct option is C $3$ feet
$1$ foot is equal to $12$ inches.
$1foot=12inches$


Multiplying both the sides of the above equation by $3$:
$3\times 1foot=3\times 12inches$
$3feet=36inches$

$36inches$ would be equal to $3feet$.

Therefore, option (c.) is the correct answer.