In the “Underlying reasons ‘unclear’” section of “Yes, Sitting Too Long Can Kill You, Even if You Exercise,” how does the author develop the idea that experts are not sure why sitting for so long can hurt you? A. In the section, the author contrasts two experts who have different opinions of the study and then allows readers to infer the central idea.
B. The author provides many contradictory details in the section and then concludes it by summarizing the central idea.
C. The author states the central idea in a heading and then in the section provides details about multiple possible causes.
D. The author states the central idea in a sentence at the beginning of the section and then supports it with narratives about people with different health outcomes.

Identify the trade regulation concept described in each scenario. protectionism free trade trade war country a and country b want to develop their respective export markets. both countries have highly developed agricultural, industrial, and service sectors. the countries decide to initially lower trade barriers and eventually remove them completely. arrowright country a has an agrarian economy with an emerging industrial sector. to allow domestic industries to grow, country a applies quotas on all industrial products except those that are used as resources. arrowright country a passes an economic policy that will indirectly give its own companies an advantage over country b’s companies. country b alleges that the policy violates the countries’ trade agreement and imposes retaliatory tariffs. arrowright