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What is the correct answer?

4

A and B can together complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work ?

A. 6 days

B. 5 days

C. 8 days

D. 7 days

Please do not use chat terms. Example: avoid using "grt" instead of "great".