Final answer:
The best topic sentence for the paragraph discussing commuting issues and potential solutions is (option D): 'As highways become more congested and commute times becoming increasingly longer, companies should consider flex-time or satellite offices,' because it outlines the main idea effectively.
Step-by-step explanation:
The most effective topic sentence for the given paragraph is D: As highways become more congested and commute times becoming increasingly longer, companies should consider flex-time or satellite offices. This sentence directly addresses the commuter issues discussed in the text and introduces solutions that could alleviate these problems, namely the adoption of flex-time and establishing satellite home offices by companies. The topic sentence encapsulates the main idea that commuting is becoming more problematic but there are viable solutions that could benefit both workers and companies.