Which sentence from the passage is a minor supporting detail?

1 “Spurred on by Goodall's findings, other researchers began studying chimpanzee behavior more closely.” (paragraph 9)

2 “We do know that the use of chimps for science, in entertainment, and as pets, goes back hundreds of years.” (paragraph 3)

3 “Zoos had long been one of the most serious offenders.” (paragraph 10)

4 “Humans have had a long and complicated history with chimpanzees.” (paragraph 1)