Final answer:
Option (c) is the best choice, as it uses the subordinating conjunction 'although' to clarify the contrast between what may seem ordinary and what is considered excellent or distinguished in modern translations.
Step-by-step explanation:
The best way to clarify the meaning of sentences 14 and 15 in the context provided would be to use a subordinating conjunction that indicates a contrast between what might seem ordinary and what is actually regarded as exceptional. Option (c) is the best choice, as it uses the subordinating conjunction 'although' to clarify the contrast between what may seem ordinary and what is considered excellent or distinguished in modern translations.
Therefore, option (c) "This quality might seem ordinary to a modern reader, although one modern translation renders this term as 'excellent' and another as 'most distinguished'." is the most appropriate choice as it shows the contrast by indicating that despite seeming ordinary, modern translations convey a sense of distinction.