What potential sources of bias are present, if any? Select all that apply.
A.
Certain subplots may have more or fewer potato plants than others. Samples from these subplots may bias the overall sample.
B.
The sample only consists of the potato plants that are easiest to reach. This may not be representative of the entire population.
C.
It is possible that, due to sampling error, the sample will not be representative.
D.
There are no potential sources of bias.