How do paragraphs 19-20 contribute to the development of ideas in the text? question 4 options: a they emphasize how little is truly known about how much energy people use and what they use it for. b they stress how complicated it is to get people who use a lot of energy to switch to energy-efficient products. c they show how understanding people and their energy-usage will lead to better energy-saving methods. d they support the claim that watching television is the biggest waste of energy in most households.

The rich natural resources made the sacramento valley a "garden of eden." permanent villages were established about 8,000 years ago.which choice combines these two sentences from paragraph two to achieve a coherent flow of ideas? a) the rich natural resources made the sacramento valley a "garden of eden" and permanent villages were established about 8,000 years ago. b) permanent villages were established about 8,000 years ago and the rich natural resources made the sacramento valley a "garden of eden." c) the rich natural resources made the sacramento valley a "garden of eden; " and so the permanent villages were established about 8,000 years ago. d) because of the rich natural resources which made the sacramento valley a ‘garden of eden,’ native americans established permanent villages there 8,000 years ago.