Very small particles sometimes fall surprisingly quickly from near the ocean surface to the seabed,
thus avoiding being carried great lateral distances by currents. This is possible because __________.
(a) the particles, though tiny, are very heavy and fall quickly
(b) the particles adhere to large particles and fall with them
(c) the particles are compressed in the fecal pellets of small marine animals
(d) the particles resist the action of currents and fall straight to the bottom