What were the author and his wife doing in Nanjing in the spring of 1987?
A.
They were learning arts education in Chinese kindergartens and elementary schools.
B.
They want their son to learn arts education in Chinese kindergarten in Nanjing.
C.
They were studying different art approaches between American and Chinese.
D.
They were studying arts education in Chinese kindergartens and elementary schools in Nanjing.