Archaeological findings suggest that Chhattisgarh has been inhabited since:

The Paleolithic Age
The Vedic Age
The Gupta Period
The 18th century

The correct answer is: The Paleolithic Age.

Archaeological findings suggest that Chhattisgarh has been inhabited since the Paleolithic Age. The earliest evidence of human habitation in Chhattisgarh is found in the form of stone tools and fossils. These tools and fossils have been dated to the Paleolithic Age, which is the earliest period of human history. The Paleolithic Age is characterized by the use of stone tools and the hunting and gathering of food.

The Vedic Age is the second period of Indian history. It is also known as the Aryan Age. The Vedic Age is characterized by the development of Hinduism and the Aryan culture. The Vedic Age is dated from 1500 to 500 BCE.

The Gupta Period is the third period of Indian history. It is also known as the Golden Age of India. The Gupta Period is characterized by the development of art, literature, and science. The Gupta Period is dated from 320 to 550 CE.

The 18th century is the fourth period of Indian history. It is also known as the Mughal Period. The Mughal Period is characterized by the rule of the Mughal Empire. The Mughal Empire was founded by Babur in 1526.

In conclusion, the correct answer is: The Paleolithic Age.