In the following chart, the horizontal line is time and vertical line is temperature. $K$ and $L$ are solid matters that are placed in two identical pots within the same room and are being heated up with identical heaters.
(Translation: Sıcaklık = temperature, Zaman = time, dak (dakika) = minute, maddesi = substance)
Which ones of the following are true?
A-) If $K$ and $L$ are different matters, they have the same mass.
B-) If masses of $K$ and $L$ are different, they can be the same matter.
C-) If masses of $K$ and $L$ are equal, they are different matters.
I chose "only $B$" which turned out to be wrong while the correct answer is "$B$ and $C$" and in the explanation it said "You picked the wrong answer because you think different matters can't have the same boiling/melting point." which is true because they can't, right?