Solution:(d) The Prime Minister has said that the government will extend help to the unorganized sector (Correct)(a) The Prime Minister said that the government would extend help to the unorganized sector(Change of tense in the Reported speech to simple past is incorrect)
(b) The Prime Minister has said that the government extend help to the unorganized sector(Change of tense in the reported speech to simple present is incorrect)
(c) The Prime Minister said that the government has extended help to the unorganized sector(Change of tense in the Reported speech to present perfect is incorrect)
Note- When the reporting speech is in present tense, Tense of reporting verb does not change. Going through the options, only option d satisfies the condition.