It was an increase in reported cases of malaria along the Gulf Coast that in 1921 led the health authorities’ granting a permit for experimentation with human subjects to the group that later would be called by the name of Unimedco.
(A) authorities’ granting a permit for experimentation with human subjects to the group that later would be called by the name of
(B) authorities’ granting a permit for experimentation with human subjects to the group that later to be called by the name of
(C) authorities’ granting a permit for experimentation using human subjects to the group that later would be called by the name of
(D) authorities to grant a permit for human experimentation to the group later called（D）
(E) authorities to grant a permit for human experimentation to the group that later would be called by the name of.
此题为什么选D呢？？
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