Notice that PPFs B and A intersect the vertical (good 2) axis at the same point. If all resources are used to produce good 2 it doesn't matter which PPF we're on, the same amount of good 2 can be produced. However, on PPF A, if all resources are being used to produce good 1 much more can be produced than on PPF B. Thus, either the technology for producing good 1 has improved (the correct answer) or more resources useful only in producing good 1 have been acquired (not a choice, but it would have been correct had it been a choice.)
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