Samuel Johnson’s Rasselas most fundamentally emphasizes which theme from Johnson’s other works or other 18thcentury works ?

A. The need for linguistic correctness as exemplified in his Dictionary
B. The promise of universal knowledge as epitomized by the Encyclopédie
C. The ultimate impossibility of achieving hapess, as espoused in his poem “The Vanity of Human Wishes”
D. The need for self-sufficiency as detailed in novels like Robinson Crusoe