Step 1: Understanding the Concept:
This question asks for the interpretation of the phrase "deftly etched characters" used to describe Subbu's literary work.
Step 2: Detailed Explanation:
The word "deftly" means skillful and clever.
"Etched" in the context of writing means characters that are vividly and clearly defined.
Creating dozens of such complex and well-defined characters requires a high level of literary skill and creativity.
Therefore, it proves he was a skillful writer.
Step 3: Final Answer:
The correct option is (B).