Answer:
Objective tone is used when a writer wants to deliver information in a neutral, factual and unbiased way. Objective tones can be achieved by avoiding personal pronouns, judgmental words that may indicate personal feeling and emotive words that indicate an opinion on the part of the writer.
Explanation:
Maybe it is ( just maybe ) the scientist were very exited after they made that discovery BECAUSE they have been searching for it for years
It would be D because we know more from that character.