The correct answer is: Only conclusion I follows.
The statement says that the Prime Minister will make every possible effort for the upliftment of poor farmers and farmhands. This does not mean that all others have got benefits of fruits of development. It also does not mean that no serious efforts have been made in the past for upliftment of any section of the society.
Conclusion I follows from the statement because the Prime Minister has specifically mentioned that his government will make every possible effort for the upliftment of poor farmers and farmhands. This implies that poor farmers and farmhands are not getting the benefits of development and that the government will take steps to address this issue.
Conclusion II does not follow from the statement because the Prime Minister has not said anything about the efforts that have been made in the past for the upliftment of any section of the society. It is possible that serious efforts have been made in the past, but they have not been successful. It is also possible that no serious efforts have been made in the past.
Therefore, the only conclusion that follows from the statement is conclusion I.