Parts of the given sentence have been underlined. One of them contains an error.

Select the option that has the segment with a grammatical error.

The art historian argued that the painting's value has been greatly underestimated, and that its unique style and technique deserved recognition from the art community and the public alike.

The correct answer is has been greatly underestimated.

Step-by-Step Analysis:

1. Sentence Structure and Tense Consistency:
The main verb of the sentence is "argued" ("The art historian argued..."), which is in the simple past tense. This establishes the time frame of the statement as the past.

2. Examining the Underlined Portions:
- "has been greatly underestimated": This uses the present perfect tense ("has been"). However, because the main reporting verb ("argued") is in the past tense, the reported clause should maintain tense consistency. The action of underestimating occurred prior to the arguing, meaning it should be expressed in the past perfect tense ("had been greatly underestimated").
- "its unique style and technique": This is grammatically correct. The pronoun "its" is the possessive form referring back to "the painting's", which is singular.
- "recognition from the art community" and "and the public alike": These prepositional phrases and conjunctions are grammatically correct and flow naturally.

3. Correcting the Error:
To fix the error, change the present perfect "has been" to the past perfect "had been" to match the past-tense narrative established by the verb "argued".
Corrected Sentence: "The art historian argued that the painting's value had been greatly underestimated..."