阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
体裁：说明文 话题：公民科学 时间：7分钟
Citizen science is a term used for projects or ongoing programs of scientific work in which individual volunteers or networks of volunteers，many of whom may have no specific scientific training，perform or manage researchrelated tasks such as observation，measurement or computation.
An example of citizen science is a project called Project BudBurst.Over the past six growing seasons，Project BudBurst has used thousands of volunteer observers.They record when local plants develop their leaves，flowers and fruit.The observations go into a huge database.Then plant scientists can study the data to look for changes over time.Project director Sandra Henderson says participatory science like this is an idea that is growing quickly.
For example，people who enjoy astronomy can observe changes in the brightness of a star.People can examine satellite images of Earth to look for sites where archeologists might find the lost tomb of Genghis Khan，the Mongolian warrior and ruler.Or someone interested in orca whales can listen to underwater microphones and let researchers know when the whales are present.Thousands of Americans and Canadians volunteered to count birds this past migration season as part of Project FeederWatch.Another area where citizen science has grown is in testing water.Amanda Bruner coordinates SoundCitizen，a project based at the University of Washington campus in Tacoma.It keeps track of pollutants in Puget Sound.
