ACCorDing to thE pAssAgE, thE usE oFAntArCtiC krill As A FooD is An innovAtion whosE FuturE is ______.
A、BAsiCAlly gloomy But still unCErtAin
B．somEwhAt promising But vEry tEntAtivE
C．gEnErAlly Bright AnD virtuAlly AssurED
D．EnDAngErED By CErtAin tEChniCAl proBlEms