At the beginning of year 2021, XYZ company had $3,000 of supplies. During the year, it purchased supplies costing $6,000, and at December 31 supplies on hand totaled $2,000. What journal entry must be made at December 31, 2021? A. Dr. Supplies 2,000 / Cash 2,000 B. Dr. Supplies 6,000 / Cash 6,000 C. Dr. Supplies expense 6,000 / Supplies 6,000 D. None of the above