To find the relative order, combine the inequalities: Reema > Mona > Leena (from I) and Reema > Pooja > Mona (from II). Merging these gives Reema > Pooja > Mona > Leena.

B: The combined information provides a definite sequence of all four individuals, making the second oldest identifiable. C: Statement II alone does not mention Leena, so the position of all four cannot be established. D: Statement I alone does not mention Pooja, making it impossible to determine the relative rank of all four.

In ranking-based Data Sufficiency, always look for common variables (in this case, Mona and Reema) to bridge the statements into a single, ordered sequence.