In 2004, a scientific exploration discovered a group of Norway spruce trees on a remote hilltop in Sweden. (1)They were vacationing with their families when the discovery occurred. (2)The scientists didn't think the trees looked very old but were astounded to learn that one of the roots has likely been growing for around 9,550 years! (3)That would make it the oldest tree, and the oldest living thing, known anywhere on the planet. Scientists estimated the age of the tree using a process called radiocarbon dating, which involves an in-depth chemical analysis of the wood. Although that is an unusual method for dating living trees, many experts believe the test was accurate. (4)How could a tree possibly live that long? According to Leif Kullman, one of the scientists who examined the tree, the spruce has a special way of staying alive. "As soon as a stem dies, a new one emerges from the same root stock, so the tree has a very long life expectancy," said Kullman. Which sentence in this paragraph does not belong?
A) Sentence 1
B) Sentence 2
C) Sentence 3
D) Sentence 4