They talked in detail about the ___ of setting up

b
他们详细讨论建立每个学生都可以按照自己步调做事的试验学校的可能性

选D.(可行性)

他们很详细的讨论了关于建设一所实验性的可以让孩子们以自己方式学习的学校的可能性.

A是适合,C是概率,B是可能性.

其实feasibility(可行性)和 possibility(可能)都行, feasibility更合适.
They talked in detail about the (feasibility) of setting up an experimental school in which each child works at his or her own pace.
他们详细讨论了设立一所每个孩子都可以按自身情况工作的实验学校的可行性.

They talked in detail about the ___ of setting up an experimental school in which each child works at his or her own pace.
D. feasibility
他们就关于创办一所能使每个孩子有展示其特长
的实验学校的可行性，进行了详细的交谈。