Based on the given statements, select the most appropriate option to solve the given question. If two floors in a certain building are 9 feet apart, how many steps are there in a set of stairs that extends from the first floor to the second floor of the building?

(a) Statement I and II together are not sufficient.

(b)Both statements together are sufficient, but neither statement alone is sufficient.

(c) Statement II alone is sufficient, but statement I alone is not sufficient.

(d) Statement I alone is sufficient, but statement II alone is not sufficient.