Rearrange the parts of the sentence in correct order.
North India
P: needs a more holistic solution
Q: to the toxic air that residents
R: breathe at the onset of winter

Let's join the parts logically starting with the subject "North India":
"North India" requires a verb phrase to complete the clause. Part P begins with the verb "needs" → "North India needs a more holistic solution".

The noun "solution" is naturally followed by the preposition "to" to denote what the solution addresses. Part Q begins with "to" → "...solution to the toxic air that residents".

Part R naturally completes what residents do with the toxic air → "...residents breathe at the onset of winter".

Combining these gives: P-Q-R.

Therefore, the correct option is B.