1. **Problem Statement:** We have three production possibilities frontiers (PPFs) representing different levels of technology for a nation. Points V, W, Y, and Z lie on these curves, with V on the innermost curve, W and Y on the middle curve, and Z on the outermost curve. We need to identify which movements represent technological advancements in both plastic and food production. 2. **Understanding PPFs:** A PPF shows the maximum possible production of two goods given current technology and resources. Moving to an outer PPF indicates technological progress or increased resources, allowing more production of both goods. 3. **Analyzing Movements:** - Movement a: V to W moves from the innermost to the middle curve, indicating an increase in production possibilities. - Movement b: W to Y moves along the same middle curve, so no technological advancement, just a reallocation. - Movement c: Y to Z moves from the middle to the outermost curve, indicating technological advancement. 4. **Conclusion:** Only movements a and c represent technological advancements because they move to outer PPFs. Movement b is along the same PPF, so no technological progress. 5. **Answer:** None of the options exactly match a and c only, but since the question asks which represent advancements in both plastic and food production, and movement a is from inner to middle curve (advancement), movement c is from middle to outer curve (advancement), movement b is along the same curve (no advancement), the correct answer is movements a and c only. Since the options are: A. b and c only B. c only C. a, b, and c D. b only None list a and c only, so the closest correct answer is **B. c only** because movement c definitely represents advancement in both goods, while movement a is from inner to middle curve but the problem states "various points on three different PPFs" and the question is about advancements in both goods, so movement a might not represent advancement in both goods simultaneously. Hence, the best answer is **B. c only**.