Which expression has a product that is less than zero? $($a$)(-4\mathrm{.}7)(0)($b$)(-0\mathrm{.}6)(-1\mathrm{.}7)($C$)(5\mathrm{.}9)(-2\mathrm{.}6)(13)($d$)(-9\mathrm{.}3)(1\mathrm{.}7)(-4)$