A line passes through the points (0, a) and (b, O). Which of the following is the slope of the line?
(A)\(-\frac { a } { b } \) (B)\(-\frac { b } { a } \) (C)\(\frac { a } { b } \) (D)\(\frac { b } { a } \) (E)\(\frac { a } { ab } \)
A