The correct answer is: Both I and II are implicit.
The statement “If it does not rain throughout this month, most farmers would be in trouble this year” implies that timely rain is essential for farming and that most farmers are generally dependent on rains.
If it does not rain throughout this month, then crops will not grow and farmers will not be able to harvest them. This will lead to financial losses for farmers and may even force them to leave their farms.
The fact that most farmers are generally dependent on rains means that they rely on rain to water their crops. Without rain, they will not be able to grow their crops and will suffer financial losses.
Therefore, both assumptions I and II are implicit in the statement.