Riley operates a plumbing business and this year the 3-year old van he used in the business was destroyed in a traffic accident. the van was originally purchased for $20,000 and the adjusted basis was $5,800 at the time of the accident. Although the van was worth $6,000 at the time of the accident, insurance only paid Riley $1,200 for the loss. What is the amount of Riley's casualty loss deduction.

A. 6,000

B. 14,000

C. 5,800

D. 4,600

E. 5,300