Figure 2-4 Shows Various Points on Three Different Production Possibilities

Figure 2-4 shows various points on three different production possibilities frontiers for a nation.
-Refer to Figure 2 -4. A movement from X to Y

A) is the result of advancements in food production technology only, with no change in the technology for plastic production.
B) could occur because of an influx of immigrant labor.
C) could be due to a change in consumers' tastes and preferences.
D) is the result of advancements in plastic production technology only, with no change in food production technology.