Which of the Following Would Not True About Igneous Rock

Which of the following would not true about igneous rock chemistry?

A) Igneous rocks are classified based on the percentage of silica that is in the rock
B) Felsic igneous rocks contain high percentages of silica
C) Mafic igneous rocks contain low percentages of silica but high amounts of iron and magnesium
D) Ultramafic igneous rocks contain very low percentages of iron and magnesium
E) Intermediate igneous rocks contain intermediate percentages of silica