The correct answer is Paleolithic.
The Paleolithic period is the earliest period of human history, lasting from the earliest known use of stone tools by hominins 2.6 million years ago to the end of the Pleistocene approximately 11,700 years ago. It is characterized by the use of simple stone tools and the absence of agriculture.
The Gupta period was an Indian historical period from 320 to 550 CE, best known for its achievements in art, literature, science, technology, engineering, and mathematics. It was a golden age of Hindu culture.
The Mughal period was an Indian historical period from 1526 to 1857, best known for its achievements in architecture, painting, and literature. It was a period of Muslim rule in India.
The Modern period is the current period of human history, beginning with the Industrial Revolution in the 18th century and continuing to the present day. It is characterized by rapid technological and social change.
The Paleolithic period falls within the prehistoric era of Chhattisgarh because it is the earliest period of human history in Chhattisgarh. The Gupta period, Mughal period, and Modern period are all historical periods that fall within the historic era of Chhattisgarh.