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Polymer Matrix Composites (PMCs) and Carbon-Carbon Composites are both subcategories of:

ACeramic Matrix Composites
BHybrid Composites
CMetal Matrix Composites
DOrganic Matrix Composites
Answer & Solution
Correct answer: D. Organic Matrix Composites
OMC encompasses both PMC (polymer matrix, e.g. epoxy + glass fiber) and Carbon-Carbon Composites (carbon matrix + carbon fiber, used in spacecraft heat shields).
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