It can be noted that the sentence establishes that 'prescription safety glasses' is the ultimate option for people who need vision correction, indicating that the sentence is in superlative degree. Thus, the superlative adjective "finest" is appropriate to indicate the highest degree of tailored protection. "Finer" is comparative, "fine" is positive, and "more finely" is an adverb, which doesn't fit the context.
The complete sentence: Prescription safety glasses provide the finest tailored protection for individuals with vision correction needs.
Hence, the correct answer is option (a).
Note:
· The Positive Degree is used to denote the mere existence of some quality of what we speak about. It is used when no comparison is made.
· The Comparative degree denotes a higher degree of quality than the positive and is used when two things are compare4.
· The Superlative degree indicates the highest degree of quality and is used when more than two things (or sets of things) are compared.