【单选题】It is most likely that the researchers tagged the birds that they captured during Study 1 to: A.determine how beak depth was affected by rainfall on Island A.
B.
determine the average age of each finch population.
C.
ensure that the beak depth of each finch was measured multiple times during Study 1.
D.
ensure that the beak depth of each finch was measured only once during Study 1.