At the beginning of December, Global Corporation had $2,000 in supplies on hand. During the month supplies purchased amounted to $3,000, but by the end of the month the supplies balance was only $800. What is the appropriate month-end adjusting entry?

A. Debit Cash $4,200, credit Supplies $4,200.
B. Debit Supplies $4,200, credit Supplies Expense $4,200.
C. Debit Supplies Expense $4,200, credit Supplies $4,200.
D. Debit Cash $800, credit Supplies $800.