sCiEnCE FiCtion is CAllED A litErAry suB-gEnrE BECAusE__________.
A．it is not importAnt Enough to BE A litErAry gEnrE
B．it CAnnot BE mADE into A DrAmAtiC prEsEntAtion
C．it hAs its limits
D．it shArEs ChArACtEristiCs with othEr typEs oF prosE FiCtion