The answer to this question is B, however, I don't quite understand.
If considering Q= mc delta T, the heat released is to some extent being influenced by the no. of moles. If using that line of thought, wouldn't we want C where it has also the same no. of moles?
If we really have to arrive at B, my other proposition would be that the increase in heat is dissipated in a larger volume, hence giving a temperature rise of 6 degrees C.
I am a bit confused by this question. Any comments would be very helpful. Thank you in advance