Question

Which contains more heat 1 kg of water at 0 degree C or 1kg of water at 0 degree C ?

Answer 1

They both are equal because they both are the same thing

Answer 2

i guess you've forgotten to mention something.
but to as far the information is provided -
comaprision between 1kg water at 0°C and 1kg water at 0°C
(pss....both d values are same)
and so as both of them are equal there can only one equation fit in between i.e. =(equals to)