C. Heating the substance causes it to melt, then to boil.
(C. Heating; to boil; ) (the substance; causes; it to melt, then to boil) Context(the substance causes,List([11, 31))):(it; to melt then; )
the substance causes,List([11, 31))
C. Heating the substance it
to boil causes to melt then
it to melt, then to boil