The true sentence is the following one:
B. Individual productivity is necessary for group productivity.
Imagine a work in a group, where the people all receive their personal tasks that they will later incorporate into the group work. If each person is not productive on their own task then the whole group will not be productive!
In the east Black and White cloud created Man and in the West Blue and Yellow cloud form Women.
Where above you have to write the whole question or just don't bother writing one