In each of the questions given below four words are given in bold. These four words may or may not be in their correct position. The sentence is then followed by options with the correct combination of words that should replace each other in order to make the sentence grammatically and contextually correct. Find the correct combination of the words that should interchange. If the sentence is correct as it is then, select option “No interchange required” as your choice.

The primitive mirror (A) society was built to virtual (B) the carefree state of lived (C) that people once nature (D) in.

The correct option is A-B & C-D.

To find the correct combination of words that need to be interchanged, let us analyze the sentence contextually and grammatically:
The original sentence is: "The primitive mirror (A) society was built to virtual (B) the carefree state of lived (C)** that people once **nature (D) in."

1. Interchanging A and B:
- The phrase "primitive mirror society" is contextually awkward. Replacing mirror (A) with virtual (B) gives "primitive virtual society", which refers to a simulated or computerized ancestral community.
- In the second part, "built to virtual" is grammatically incorrect because "to" must be followed by a base verb. Replacing virtual (B) with mirror (A) gives "built to mirror" (where "mirror" is a verb meaning to copy or simulate), which is grammatically correct.

2. Interchanging C and D:
- The phrase "state of lived" is grammatically incorrect as "of" should be followed by a noun or noun phrase. Replacing lived (C) with the noun nature (D) gives "state of nature", which is a standard phrase representing a primitive, uncivilized state of humanity.
- The clause "that people once nature in" is grammatically incorrect. Replacing nature (D) with the verb lived (C) gives "that people once lived in", which correctly completes the prepositional phrase with the verb in the past tense.

Therefore, by interchanging A with B and C with D, we get the grammatically and contextually correct sentence:
"The primitive virtual society was built to mirror the carefree state of nature that people once lived in."