On a unit circle, the terminal side of angle Θ intersects the circle at point (x, y). Which of the following expressions would make the statement true? a) sin Θ = (x, y, the ratio of x to y, the ratio of y to x)
b) tan Θ = (x, y, the ratio of x to y, the ratio of y to x)
c) cos Θ = (x, y, the ratio of x to y, the ratio of y to x)