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 accident, insurance only paid riley $1,200 for the loss. what is the amount of riley's casualty loss deduction? a. $6,000b. $14,000c. $5,800d. $4,600e. $5,300