Answer:
E. Faced with a negative population growth rate, the country relaxed immigration control norms 25 years ago.
Step-by-step explanation:
Given that immigrants increase the population and that they may come from a less healthy environment, having a less healthy background is very common for them. Even if the domestic population had a high average height, the mean value will surely decrease to the lower height of the immigrants.
Therefore, a correlation between economic growth and average health measured by height can be undermined, given E) is true.