The correct answer is: E. No error
The sentence is grammatically correct and does not contain any errors.
The sentence is in the passive voice, which is a common way to write about scientific studies. The passive voice is used to focus on the action being performed, rather than the person or people performing the action. In this case, the action is “growing new stem cells in the ear.” The subject of the sentence is “a team of scientists,” but they are not the focus of the sentence. The focus is on the action of growing new stem cells.
The sentence is also clear and concise. The meaning of the sentence is easy to understand, and the sentence is not too long or too complex.
The sentence is also relevant to the topic of the question, which is about a study that attempted to grow new stem cells in the ear.
Overall, the sentence is grammatically correct, clear, concise, and relevant. Therefore, the correct answer is: E. No error.