Discussion
Composition of the resultant partial melts is different from the composition of original rock primarily because of :
Answer: C
Partial melts differ from their source because of the difference in melting temperatures of minerals.
A rock is a mixture of minerals that do not all melt at the same temperature. On heating, the first liquid forms from the lowest-melting combination (near the eutectic or minimum), so it is rich in the components of those minerals, such as feldspar and quartz in a crustal rock or clinopyroxene in peridotite, while refractory minerals like olivine stay behind.
If minerals melted at the same temperature (option D) the melt would match the rock. Buoyancy moves melt but does not set its composition, and fractional crystallisation acts on a melt after it has formed, not during melting.
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