The correct answer is option 2 - Regulating Act. The Pitts India Act of 1784 was a significant legislation passed by the British Parliament to regulate the company’s affairs in India. This Act was named after Charles Pitt, the British politician who introduced it.

Option 1, White paper, is incorrect as a white paper refers to a government document that outlines policy proposals or discusses issues in order to inform the public or stakeholders.

Option 3, Ordinance, is incorrect as an ordinance is a law or regulation issued by a governing body like a central or state government.

Option 4, Resolution, is incorrect as a resolution is a formal decision or statement that is passed or adopted by a group or organization.

Therefore, the correct answer is option 2 - Regulating Act.