Concept:Rearranging jumbled parts of a sentence to form a logical and grammatically correct sequence.
Explanation:Start with the main subject: “The essay” is a literary form; so R comes first.
Then, S (“which is not easy to define”) naturally follows as it describes the literary form.
Next, Q (“because its variety is infinite”) gives the reason why it is not easy to define.
Finally, P (“like that of the human face”) compares the infinite variety to something familiar.
Thus, the correct order is R → S → Q → P, i.e., RSQP.
No other option places Q before P, which is essential because “infinite variety” directly links to “like that of the human face”.
Hence, the only matching sequence is option (3).
Answer:Option (3) i.e., R S Q P.