Which statement correctly compares transverse and longitudinal waves in terms of their potential to be polarized?
(a) Both transverse and longitudinal waves can be polarized if they pass through an appropriate filter, because polarization simply selects vibrations along the line of travel.
(b) Neither transverse nor longitudinal waves can be polarized, because polarization applies only to electromagnetic waves such as light.
(c) Transverse waves can be polarized because their oscillations are perpendicular to the direction of travel, whereas longitudinal waves cannot because their oscillations are parallel to the direction of travel.
(d) Longitudinal waves can be polarized because their compressions align along one axis, whereas transverse waves cannot because they oscillate in two perpendicular axes.