Detailed Answer
Answer (A) is correct. Cost of goods sold equals cost of goods manufactured (COGM) adjusted for the change in finished goods. COGM equals the sum of raw materials used, direct labor costs, and production overhead, adjusted for the change in work-in-progress. Raw materials used equals $255,000 ($105,000 BI + $300,000 purchases – $20,000 returns – $130,000 EI). Thus, COGM equals $1,650,000 ($255,000 RM + $600,000 DL + $750,000 OH + $220,000 BWIP – $175,000 EWIP), and COGS equals $1,480,000 ($1,650,000 COGM + $90,000 BFG – $260,000 EFG).