阅读下列短文，然后根据短文的內容從每小题的四个选项中选出可填入相应空白处的最佳选择，并把它前面的大写字母填入左边括号里。
A
Grandma Moses is among the most famous twentieth-century painters of the United States，yet she had only just begun painting in her late seventies．As she once said of herself：“I would never sit back in a rocking-chair，waiting for someone to help me．”
She was born on a farm in New York State．At twelve she left home and was in a service until at twenty-seven，she married Thomas Moses，the tenant of hers．They farmed most of their lives．She had ten children，of whom five survived；her husband died in 1928．
Grandma Moses painted a little as a child and made embroidery pictures as a hobby，but only changed to oils in old age because her hands had become too stiff to sew and she wanted to keep busy and pass the time．Her pictures were first sold at an exhibition，and were soon noticed by a businessman who bought everything she painteD．Three of the pictures were shown in the Museum of Modern Art，and in 1940 she had her first exhibition in New York．Between the 1930‘s and her death she produced some 2，000 pictures：careful and lively pictures of the country life she had known，with a wonderful sense of color and form．

Grandma Moses spent most of their life________．

A.nursing
B.painting
C.farming
D.embroidering