Concept:Jumbled sentence reordering requires identifying logical and grammatical links between parts.Explanation:The sentence opener must introduce the subject clearly.Part Q ("India achieved remarkable economic development") sets the main context, so it comes first.Part P ("in the years following") naturally follows Q to indicate the time frame after an event.Parts S and R form a pair: S ("the landmark reforms inaugurated via") is followed by R ("liberalization in the year 1991"), because "via" requires the object "liberalization".Thus the correct sequence is Q → P → S → R.Answer:Option D (QPSR)