Which three temperature readings all mean the same thing?

All the three given represent the same temperature in different scales

Kelvin is absolute temperature where 273 is added to the centigrade value

K = C+273

HEnce 273 Kelvin when converted into centigrade gives

273-273 = 0 degree centigrade

273 K = 0 C

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Fahrenheit to centigrade conversion is

C=

Hence when F=32, we get C=0

Thus all three are one and the same.

there are no atoms