A)    A body of low Thermal capacity gets heated or cooled quickly    B)    Good emitters are bad reflectors

Thermal capacity = ms so when thermal capacity is low, specific heat s should be low. If s is low, from the equation ∆θ=Qms, we conclude that a body gets heated or cooled quickly. So statement (A) is rightτ+r+a=1, for a given τ if 'a' is high, r will be low. Here a = Absorption coefficient, r=reflectivity and τ= transmission coefficient we know, when 'a' is high, 'e' will be high.So statement (B) is right.