Explanation

The sentence is explaining why the exhibition of the painter’s work was unsatisfactory, and since it says that the painter’s talents were real, the word in the blank has to indicate why those talents were not, in the opinion of the author of the sentence, good enough. The words “limited” and “circumscribed” do so and also produce sentences that are alike in meaning, so this pair forms the correct answer.

Although “undiscovered” and “hidden” are similar in meaning, they do not make sense in the context of the sentence, since they do not indicate why the painter’s talents were not adequate. Other choices, such as “partial” and “prosaic” might make sense in context, but none of the other choices that meets that criterion also has a companion choice that would produce another sentence alike in meaning.

Thus the correct answer is limited (Choice A) and circumscribed (Choice D).
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Sandy
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a nd d

If you look at these 4 words - limited, partial, prosaic and circumscribed, they seem to fit in the sentence individually and satisfy the context.
Now comes the essence of sentence equivalence, where we want pair of words that:
1. obviously fit the context, and
2. make sense together as a pair i.e. if you alternate the words in the pair, meaning pf the sentence doesn't change.

Lets leave "prosaic" - as it doesn't have a companion for the pair. There are 3C2 i.e. 3 possible combinations => (limited, partial) ; (partial, circumscribed) ; (limited, circumscribed)

1. From a synonym strength perspective, (limited, circumscribed) rank higher. Though (limited, partial) can be thought to convey the meaning of "incomplete", they are not strong synonyms especially compared to (limited, circumscribed)
2. And, you are using these words as adjectives to describe "talents". "limited" generally goes with talents, not "incomplete" (incomplete conveys something is not complete, here "talent" is not complete but wrt to what?)