Delta Diamonds uses a periodic inventory system. The company had five one-carat diamonds available for sale this year: one was purchased on June 1 for $900, two were purchased on July 9 for $1,000 each, and two were purchased on September 23 for $1,050 each. On December 24, it sold one of the diamonds that was purchased on July 9. Using the specific identification method, its ending inventory (after the December 24 sale) equals:

A. $4,000.

B. $1,000.

C. $2,900.

D. $4,100.