Reading Comprehension (RC) | Re: In corporate purchasing, competitive scrutiny is typically limited to

For question 510 (which of the following can be inferred about supplier partnerships, as they are described in the passage?), where in the text is choice A disproved? Is it disproved by Type 1 situations in that they can be sustained when there are many alternatives and change??iseasy?

(A) They cannot be sustained unless the goods or services provided are available from a large number ofsuppliers.