One characteristic of top-performing sales organizations is that they have a tendency to have concentrated greater resources in the direction of a smaller, more careful selection of a number of important customers than is the case with other sales organizations.

a) that they have a tendency to have concentrated greater resources in the direction of a smaller, more careful selection of a number of important customers than is the case with

b) that they tend to concentrate more resources to a smaller, more careful selection of a number of important customers than toward

c) that they have a tendency to concentrate more resources on a smaller, more careful selection of a number of important customers as opposed to

d) that they tend to concentrate more resources on a smaller, more carefully selected number of important customers than do

e) the tendency to concentrate a greater amount of resources on a careful and small selection of a number of important customers as opposed to

isn't this a run on sentence in option D:

that they tend to concentrate more resources on a smaller, more carefully selected number of important customers than do

Dear daagh,

Can you explain what is smaller modifying in the sentence?
concentrate more resources on a smaller , ....
Smaller what?

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