A Physics Student Looks into a Microscope and Observes That

Multiple Choice

A physics student looks into a microscope and observes that small particles suspended in water are moving about in an irregular motion.Which of the following statements is the best explanation for this observation?

A) Water molecules strike the particles giving them the same average kinetic energy as the water.
B) The particles are carried by convection currents in the water.
C) The small particles may be considered a fluid;and thus,move about randomly.
D) The actual motion is regular,but the speeds of particles are too large to observe the regular motion.
E) The particles are moving to be uniformly distributed throughout the volume of the water.