Which of the Following Statements About Varve Chronology Is NOT

Which of the following statements about varve chronology is NOT true?

A) Summer sediment layers are dark- colored, while winter sediments are light- colored.
B) Varve layers are examined in cores extracted from the bottom of a lake.
C) Varves are more apparent in lakes that freeze in winter than in those that do not.
D) Varves can be used to date geologic events that had an effect on a lake.