Cost of Goods Sold requires complete inventory data Steps:

• Identify components: Opening inventory ($1780) + purchases ($2340) + carriage inwards ($700) gives goods available for sale ($4820).
• Adjust for goods taken for own use: Subtract $180, resulting in$4640 available after drawings.
• Apply standard COGS formula: COGS = opening inventory + net purchases (including carriage inwards) - closing inventory - goods for own use.
• Note absence of closing inventory: Cannot compute exact COGS without it.

Not enough information to determine COGS or confirm option C.

Final answer: Not enough information.