Short Answer 
The answer explains that a paradox, seen in the phrase “whose origin was a terminus,” juxtaposes the beginning and endpoint, prompting deeper thought. It also highlights the pun as a clever wordplay that enriches the text, showing the complexity and wit in the language of *”The Importance of Being Earnest.”*
Step 1: Understand the Paradox
A paradox is a statement that seems contradictory but may actually reveal a deeper truth upon closer examination. In the excerpt, the idea that something’s origin is referred to as a terminus is paradoxical because it juxtaposes the starting point with an endpoint. This contradiction invites readers to think critically about the meaning behind the words.
Step 2: Identify the Pun
A pun is a form of wordplay that exploits different meanings of a term or similar-sounding words for humorous or rhetorical effect. In this case, the phrase “whose origin was a terminus” serves as both a paradox and a pun, combining the concepts of beginning and ending. This clever play on words adds an entertaining layer to the text and illustrates the complexity of language.
Step 3: Associate with the Text
The excerpt in question comes from *”The Importance of Being Earnest,”* highlighting the clever use of language by the author. Recognizing the paradox of origin as a terminus, along with its pun, emphasizes the text’s wit and complexity. Thus, the correct option, marked as D, effectively represents the fascinating interplay between meaning and language in literature.