Starslikethesuncancontinuetoshinesteadilyforbillionsofyearsbecauseitslightandheatareproducedbynuclearfusion,inwhichtitanicreleasesofenergyresultinthelossofonlytinyamountsofmass.（）
(A)itslightandheatareproducedbynuclearfusion,inwhich
(B)nuclearfusionproducesitslightandheat,inwhich
(C)nuclearfusionproducestheirlightandheat,where
(D)itslightandheatareproducedbynuclearfusion,where
(E)theirlightandheatareproducedbynuclearfusion,inwhich