Why does the author provide the information that "in northern Europe the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night"? A. To emphasize the variety of environments in which people used sun and water clocks to tell time B. To illustrate the disadvantage of sun and water clocks C. To provide an example of an area where water clocks have an advantage over sun clocks D. To counter the claim that sun and water clocks were used all over Europe