The question is divided into four parts where one of the parts may or may not contain an error. Choose the part that has the error as your answer. If all the parts are correct choose “No error” as the answer choice.
Sarah is considered one of (A)/ the top researcher in the field (B)/ of neuroscience due to (C)/ her groundbreaking discoveries. (D)

Correct option is B

The error lies in the part (B). The error in part (B) is in subject-verb agreement; "researchers" is the correct plural form to match "one of."
The error in the original sentence is a subject-verb agreement issue. The phrase "one of the" is followed by a plural noun, which should be matched with a plural verb. In this case, "researcher" is singular, but the correct form should be "researchers," which is plural.
To maintain subject-verb agreement, it should be "one of the top researchers" to correctly indicate that Sarah is part of a group of top researchers in the field of neuroscience.
Thus, the correct sentence formed will be: “Sarah is considered one of the top researchers in the field of neuroscience due to her groundbreaking discoveries.”