Discount allowed on goods invoiced at N100,000 was calculated at the rate of 20% instead of 10%. The error is corrected by debiting

A. customer account with N20,000 crediting discount allowed with N20,000
B. discount allowed with N10,000; crediting customer's account with N10,000  
C. customer's account with N10,000, crediting discount allowed with N10,000
D. discount allowed with N20,000, crediting cash with N20,000

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Correct Answer: B