题目内容：
根据下面资料，回答题 Maria Mitchell (1818 -1889),the first woman astronomer (天文学家) in the United States,wasborn in Nantucket, Massachusetts．Her parents valued education and insisted on giving her the samequality of education that boys received．
Her father, William Mitchell, was an astronomer and teacher himself．When he built his own school,
Maria became a student and also a teaching assistant to him．At home, Maria' s father taught her to watchthe stars and other natural objects in space using his personal telescope (望远镜)．
Later she went to work at the library of the Nantucket Atheneum．Over the next twenty years, shefurther developed her interest in reading as many books as she could．She spent her nights watching thesky closely with her father．
On October 1,1847,Maria discovered a comet (彗星) by merely using a two-inch telescope．Someyears before, King Frederick VI of Denmark had set up prizes to each discoverer of a "telescopiccomet"．The prize was to be given to the "first discoverer" of each such comet because comets were oftendiscovered by more than one person．
There was once a question of who should be the winner．As the story goes, Francesco de Vico haddiscovered the same comet two days later, but had reported it to the European official organization first．
However, after some discussion this was settled in Mitchell' s favor．She won the prize in 1848 and becamea big name the world over．The comet was named "Miss Mitchell' s Comet"．
What can be learnt about Maria' s parents according to the text? A．They came from low-income families．
B．They gave Maria equal chance for education．
C．They were both astronomers．
D．They were both teachers．
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