Answer :
Answer: Option 'D' is correct.
Step-by-step explanation:
If there is difference between the sample mean and the population mean, then it is known as "Sampling error".
As we know that standard error of the mean is given by
[tex]\dfrac{\sigma}{\sqrt{n}}[/tex]
and the sampling error refers to the difference in the value of sample mean and the value of population mean.
Hence, Option 'D' is correct.