Mrs. Rogers challenges her students to study moon phases to determine if what they have learned from the textbook is correct. How might one of Mrs. Rogers’ students investigate claims made in a textbook that moon phases happen every 28 days? Group of answer choices

A. Observe the moon every night for one month

B. Compare the textbook phases to the actual moon phases over a three month period

C. Compare diagrams of moon phases from the textbook to diagrams online

D. Observe the moon phases seen each night for approximately a year