Step 1: Understanding the Concept:
The question asks for an evaluation of Subbu's acting skills in comparison to the lead actors as per the author's observation.
Step 2: Detailed Explanation:
The passage describes Subbu as an "amazing actor" who did not aspire to lead roles.
The text states that in whatever "subsidiary role he played... he performed better than the supposed main players."
This highlights his exceptional talent, which often outshone the designated stars of the film.
Step 3: Final Answer:
The correct option is (C).