select the item bellow thjat represents of idiosyncratic risk. a the federal reserve interest rates by $0\mathrm{.}25\%$ tresury bill rate b the us equity markets suffer a $10\%$ b the us equity market suffers a $10\%$ market correction. c stink co is fined $2$ billion by the neviormental protection agency. d the us enemployement rate jumps to $15\%$