Examine the built-in dataset ChickWeight. Which of the following is true:
A. ChickWeight is not tidy: each chick has more than one row.
B. ChickWeight is tidy: each observation (a weight) is represented by one row. The chick from which this measurement came from is one the variables.
C. ChickWeight is not a tidy: we are missing the year column.
D. ChickWeight is tidy: it is stored in a data frame.
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