In the question below, a sentence is given with four words highlighted. These four words are 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 replace each other.

India is system (A) digitising its healthcare rapidly (B), and artificial intelligence (AI) offers a huge transformation (C) to super-charge this opportunity (D).

To determine the correct arrangement of the highlighted words, let us analyze the sentence contextually and grammatically.

The original sentence is:
"India is system (A) digitising its healthcare rapidly (B), and artificial intelligence (AI) offers a huge transformation (C) to super-charge this opportunity (D)."

Let's analyze the first part of the sentence:
"India is system (A) digitising its healthcare rapidly (B)..."
Here, "digitising" is a verb. The word preceding it should modify how the digitising is happening or serve as an auxiliary, but "system" (a noun) does not fit grammatically before "digitising". Conversely, "rapidly" (an adverb) perfectly modifies "digitising". If we swap A and B, we get "India is rapidly digitising its healthcare system", which is grammatically correct and contextually meaningful because "healthcare system" is a standard noun phrase.

Let's analyze the second part of the sentence:
"...and artificial intelligence (AI) offers a huge transformation (C) to super-charge this opportunity (D)."
Here, "offers a huge opportunity" makes direct sense because AI represents a window of possibility (an opportunity). Then, "to super-charge this transformation" fits perfectly because the ongoing change is a transformation. Swapping C and D yields: "...offers a huge opportunity to super-charge this transformation."

By swapping A-B and C-D, the complete corrected sentence becomes:
"India is rapidly digitising its healthcare system, and artificial intelligence (AI) offers a huge opportunity to super-charge this transformation."

Therefore, the correct combination of words to replace each other is A-B and C-D.