According to this video of Human Development Index (HDI) vs Ecological Footprint (EF) between 1980 and 2005, which of these statements is correct? (A) All countries in North America improved both their HDI and their EF. (B) Of the five countries identified, Norway showed the greatest improvement in EF whereas Nepal did in HDI. (C) All five countries identified can now be considered globally sustainable. (D) Nepal's progress in improving HDI was at the expense of the environment.