GMAT Reading Comprehension (RC) | Re: Comparable worth, as a standard applied to eliminate

43. Which of the following most accurately states the
central purpose of the passage?
(A) To criticize the implementation of a new procedure
(B) To assess the significance of a change in policy
(C) To illustrate how a new standard alters procedures
(D) To explain how a new policy is applied in specific
cases
(E) To summarize the changes made to date as a
result of social policy

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Could any one explain why B is the answer ??? where I can find in the passage the"change in policy