What primarily influences the composition of an igneous rock?

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The depth at which the magma meltsThe chemical makeup of the molten magmaA combination of melting depth and magma chemistryIt is impossible to ascertain the compositionNot applicable

Explanation

The composition of an igneous rock is mainly controlled by the chemical composition of the molten magma from which it crystallizes. While depth can influence conditions, the magma's chemistry directly determines the rock's mineral content and overall composition.