Question: Which of the following scenarios would increase a nation's production possibility frontier (PPF)?
A: The nation's system of higher education slowly declines in quality.
B: The nation invests in research and development of new technology.
C: The nation's infant mortality rate increases.
D: Environmental pollution severely damages the health of the population.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option. Your answer should have exactly 4 paragraphs. Make sure that the first paragraph starts with the word "assistance" and that each paragraph is separated by two new lines.
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