Final answer:
Milton's deep understanding and masterful use of language empowered him to create complex and enduring epic poetry, defined by rich linguistic texture and rhetorical sophistication. The correct option is c.
Step-by-step explanation:
Milton's mastery of language helped him in his writing career as it empowered him to create epic poetry with rich language. His multilingual abilities and understanding of the deep structures of different languages enriched his own use of English, allowing him to draw upon a diverse inventory of linguistic and cultural nuances. This capability enhanced Milton's creative voice and helped him construct the intricate tapestries of narrative that define his epic works, such as 'Paradise Lost'.
Additionally, his mastery over language facilitated his use of complex rhetoric, making his prose and poetry resonate across centuries, maintaining relevance both culturally and linguistically.
Hence, Option c is correct.