Solution

By Wien's displacement law, higher temperature corresponds to shorter peak wavelength (bluer colour). Since blue light has the shortest wavelength, followed by yellow, then red: $T_A$(bluish)$>T_C$(yellowish)$>T_B$(reddish).

Concept Wien's displacement law - colour and temperature

Thermal Properties of Matter in past papers

49 questions from this chapter have appeared across 25 exam years.