Which of these igneous rocks would have a high sodium and silica content, be classified as continuous in crystallization, and be considered felsic?
a) amphibole
b) oligoclase
c) olivine
d) pyroxene

Pyroxene igneous rocks have a high sodium and silica content, be classified as continuous in crystallization, and be considered felsic.

Explanation:

Px are commonly seen in metamorphic and igneous rocks. These are the main group of rock types that forms inosilicate minerals. These are mainly found in metamorphic and igneous rocks. The pyroxenes are a group of important rock-forming inosilicate minerals found in many igneous and metamorphic rocks.

Clinopyroxenes refers to those that undergoes crystallization process in  monoclinic system and when the crystallization process occurs in a orthorhombic system the pyroxenes are called as orthopyroxenes. Pyroxene have high sodium and silica content in it.