A child is walking eastward along a flat sidewalk. She is pulling a wagon behind her with pulling force applied to the handle. The handle makes an angle of 40° with the horizontal. Rather than drawing a slanted arrow in the free-body diagram for the wagon, which two arrows could be substituted for ? an upward arrow labeled Fsin(40°), and a downward arrow labeled Fsin(40°)

two eastward arrows, one labeled Fsin(40°) and the other labeled Fcos(40°)

an upward arrow labeled Fsin(40°), and an eastward arrow labeled Fcos(40°)

an upward arrow labeled Fcos(40°), and an eastward arrow labeled Fsin40°)