Based on the given statements, select the most appropriate option to solve the given question.
If two floors in 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?
Statements:
- Each step is $3/4$ foot high.
- Each step is $1$ foot wide.
- Statement $I$ alone is sufficient, but statement $II$ alone is not sufficient.
- Statement $II$ alone is sufficient, but statement $I$ alone is not sufficient.
- Both statement together are sufficient, but neither statement alone is sufficient.
- Statement $I$ and $II$ together are not sufficient.