Correct option is B
The correct sequence of the sentence is
P, R, Q, S:
"In November, Lakshman fell seriously ill with fever and pneumonia."
Explanation of the correct sequence:
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P (In November, Lakshman fell) begins the sentence logically by introducing the subject and the context.
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R (seriously ill) follows naturally to describe the condition.
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Q (with fever) specifies the illness.
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S (and pneumonia) completes the list of health issues.
Why Other Options Are Incorrect:
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(a) P, Q, S, R: Places "with fever" and "pneumonia" together before describing the seriousness, which disrupts the logical flow.
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(c) P, Q, R, S: Incorrectly places "seriously ill" after "with fever," making the sentence less coherent.
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(d) R, Q, S, P: Starts with "seriously ill," which lacks context and does not form a meaningful beginning.