Capturing carbon dioxide and turning it into commercial products,

Capturing carbon dioxide and turning it into commercial products, such as fuels or construction materials, could become a new global industry. On average each utilization pathway could use around 0.5 giga tonnes of carbon dioxide annually that would otherwise escape into the atmosphere. A top-end scenario could see more than 10 giga tonnes of carbon dioxide a year used, at a theoretical cost of under $100 per tonne of carbon dioxide. Clearly, carbon dioxide utilization can be part of the solution to combat climate change, but only if those with the power to make decisions at every level of government and finance commit to changing policies and providing market incentives across multiple sectors.

In the argument above, the two portions in boldface play which of the following roles?

A. The first describes evidence that has been taken as supporting a conclusion; the second gives a reason for questioning that support.

B. The first describes evidence that has been taken as supporting a prediction; the second states a contrary conclusion that is the main conclusion of the argument.

C. The first provides evidence in support of the main conclusion of the argument; the second provides a requirement for the fulfillment of a prediction.

D. The first provides data that the argument as a whole seeks to explain; the second gives the condition that the argument seeks to establish.

E. The first describes the circumstance that the argument as a whole seeks to explain; the second provides a condition on which rests the position taken by the argument.