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The following question has been taken from a past ACT English section. Choose the answer choice that best expresses the idea, makes the statement appropriate for standard written English, or is worded most consistently with the style and tone of the passage. If you think the original underlined portion is best, choose "No change."

In 1948, graduate students, Norman Woodland and Bernard Silver, took on a problem that had troubled retailers for years: how to keep track of store inventories.


a. No change

b. students, Norman Woodland and Bernard Silver

c. students Norman Woodland and Bernard Silver

d. students Norman Woodland and Bernard Silver,