C. They would crystallize at high temperature because they are mafic.
Explanation:
According to the Bowen's reaction series, the rocks with a high magnesium and iron content would crystallize at high temperature because they are mafic.
Mafic rocks are usually formed at high temperature and they are rich in ferromagnesian minerals such as olivine and pyroxene.
They are shown towards the top part of the discontinuous end.
Mafic rocks are usually formed at high temperature.
They have a high amount of magnesium and iron in them.
These element allows for a rock rich in mafic minerals to form.
Such minerals forms mafic rocks like pyroxenite, basalt etc.
At the lower end are the felsic.
They are rich in silica and are predominantly made up of feldspars and silica.
