3. a grand staff (1 point)
shows both the treble and bass staff.
shows only treble staff.
shows only bass staff.
shows no clefs.

A grand staff shows both the treble and bass staff.

Explanation:

The treble staff shows the treble staff (duh). Same goes for the bass staff. The grand staff though you can kind of infer that it is grander or larger and shows both of the staffs. If you don't know what a staff is though (basic stuff come on man, you better know what a staff is), it's a set of lines and spaces where notes go basically. The higher up the staff it is, the higher pitch it is. Anddd the lower it is, the lower the pitch. -w-  Hope I helped.