Answer:
Option D. The transition that would fit in the blank in order to most effectively link claims to counterclaims is the phrase "on the other hand".
Step-by-step explanation:
The first part of the paragraph presented in the question shows a claim for the argument that offices should provide incentives to encourage its employees to use alternative transportation systems to the car. The sentence that needs the transition is the first sentence of the counterclaim of the paragraph, therefore the correct transition would be "on the other hand" which is normally use to present a contrasting point.