The grammatologist has argued that sustained observation of a few animals provides better behavioral data than does intermittent observation of many animals.
A.provides better behavioral data than does intermittent observation of many animals
B.provides better behavioral data than many animals are observed intemittently
C.providing better behavioral data than does intermittent observation of many animals
D.do provide better behavioral data than intermittent observation of many animals do
E.in contrast to intermittent observation of many animals, provides better behavioral data
为什么选A啊?