In a survivably cold environment,an ectotherm is more likely to survive an extended period of food deprivation than would an equally sized endotherm because the ectotherm

A)maintains a higher basal metabolic rate.
B)expends more energy per kg of body mass than does the endotherm.
C)invests little energy in temperature regulation.
D)metabolizes its stored energy more readily than can the endotherm.
E)has greater insulation on its body surface.