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

Figure 2-4

Figure 2-4 shows various points on three different production possibilities frontiers for a nation.
-Refer to Figure 2-4.Consider the following events:
A.a decrease in the unemployment rate
B.an increase in a nation's money supply
C.an influx of immigrant workers
Which of the events listed above could cause a movement from X to Z?

A) a, b, and c
B) a and b only
C) a and c only
D) a only
E) c only