a slope and a point (option A)
Explanation:Point slope:
[tex]\begin{gathered} y-y_1=m(x-x_1) \\ m\text{ = slope} \\ (x_1,y_1)\text{ = point} \end{gathered}[/tex]Point slope is gotten with a slope and a point that is not the y-intercept.
Hence, the point slope form is useful when all you have is a slope and a point (option A)