A fire totally destroyed office equipment and furniture which Monica uses in her business. The equipment had an adjusted basis of $15,000 and a FMV of $10,000 before the fire. The furniture's adjusted basis was $5,000 and its FMV was $2,000 before the fire. Monica's AGI for the year is $60,000. Monica does not have insurance on the destroyed assets. How much is Monica's deductible casualty loss?

a. 5,900 b. $12,000 c. $13,900 d. $20,000