The correct answer is: a) Sustainable mineral development.
Government policies in Mizoram aim to promote sustainable mineral development. This means that the government wants to ensure that the mining industry in Mizoram is developed in a way that does not harm the environment or the people who live there. The government also wants to make sure that the benefits of mining are shared fairly among all of the people of Mizoram.
Option b, rapid exploitation of resources, is not the goal of government policies in Mizoram. The government wants to ensure that mining is done in a sustainable way, which means that it should not be done too quickly. Rapid exploitation of resources can damage the environment and harm the people who live there.
Option c, export of raw minerals, is also not the goal of government policies in Mizoram. The government wants to make sure that the benefits of mining are shared fairly among all of the people of Mizoram. This means that the government wants to see some of the minerals that are mined in Mizoram processed and manufactured in Mizoram, rather than being exported as raw materials.
Option d, foreign investment in mining, is not the only goal of government policies in Mizoram. The government also wants to see local businesses involved in the mining industry. The government wants to make sure that the benefits of mining are shared fairly among all of the people of Mizoram, including local businesses.