Before you can go out, you must clean the room, mop the floor, and dusting the house.
a.
before you can go out, you must clean the room, mop the floor, and dusting the house.
b.
before you can go out, you must clean the room, mop the floor, and to dust the house.
c.
before you can go out, you must clean the room, mop the floor, and dusting.
d.
before you can go out, you must clean the room, mop the floor, and do dusting.
e.
before you can go out, you must clean the room, mop the floor, and dust the house.

The answer is a because I said

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