Which sentence uses dashes correctly?

AWe will use the same color for the bookcase—light green—that we used on the door and window frames.
BYard work—for example, raking leaves and planting shrubs—fills many of our autumn weekends.
COpen the windows—to let the breeze in—and the paint will dry fast.
DI intend to—paint that bookcase tomorrow—help me remove all the books.