Answer:
(θ)

Step-by-step explanation:
Tangent trigonometric ratio is defined as the quotient of the opposite leg divided by the adjacent leg of an angle in a right triangle.
In a unit circle, the length of the opposite leg is the y-coordinate and the length of the adjacent leg is the x-coordinate.
As per the description the radius goes to point:

Thus, the tangent is:
(θ)