Given
Studying the rainfall on the first day of September, October, and November is not a random sample for studying the rainfall on the first day of each month for one year.
To explain why.
Step-by-step explanation:
It is given that,
Studying the rainfall on the first day of September, October, and November is not a random sample for studying the rainfall on the first day of each month for one year.
The reason for Studying the rainfall on the first day of September, October, and November is not a random sample is, because these months are three specific months which means other months cannot be selected.
Hence, the answer is option b).