Examine the built-in dataset BOD. Which of the following is true: A. BOD is not tidy: it only has six rows. B. BOD is not tidy: the first column is just an index. C. BOD is tidy: each row is an...

Examine the built-in dataset BOD. Which of the following is true:

A. BOD is not tidy: it only has six rows.

B. BOD is not tidy: the first column is just an index.

C. BOD is tidy: each row is an observation with two values (time and demand)

D. BOD is tidy: all small datasets are tidy by definition.