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.

Let's analyze the sentence to find the correct placement for each bold word based on context and grammar:
Original Sentence: "The primitive mirror (A) society was built to virtual (B) the carefree state of lived (C) that people once nature (D) in."

1. Analyzing positions (A) and (B):
- The phrase "built to [verb]" requires an infinitive verb after "to". "mirror" is a verb meaning to reflect or copy, whereas "virtual" is an adjective.
- Modifying "society", we need an adjective like "virtual". Thus, swapping mirror (A) and virtual (B) gives: "The primitive virtual society was built to mirror..." which makes perfect grammatical and contextual sense.

2. Analyzing positions (C) and (D):
- The phrase "state of [noun]" requires a noun. "nature" is a noun describing a state of being or existence.
- The phrase "that people once [verb] in" requires a past tense verb. "lived" is a past tense verb.
- Therefore, swapping lived (C) and nature (D) gives: "...state of nature that people once lived in."

Putting it all together, the corrected sentence reads:
"The primitive virtual society was built to mirror the carefree state of nature that people once lived in."

Hence, the correct word interchanges are A-B & C-D.