Concept:
This question requires identifying the correct spelling of the adjective meaning "serving as a desirable model" or "representing the best of its kind."
The word is derived from the noun *example*, but its spelling shifts when transformed into an adjective based on its Latin root *exemplaris*:
• The 'a' present in *example* changes to an 'e' in the adjective form.
• The middle consonant group is 'pl'.
• The final suffix portion is spelled '-ary'.
Putting it all together gives: e-x-e-m-p-l-a-r-y.
Let us examine the incorrect spelling variations:
• Option (B) examplary: Incorrectly retains the 'a' from the noun *example*.
• Option (C) exemplery: Incorrectly changes the suffix vowel from an 'a' to an 'e' (*-ery*).
• Option (D) exemblary: Incorrectly replaces the 'p' sound with a 'b'.
Thus, Option (A) is the correct spelling.