I am kind of lost with this question and need some help....

Which of the following is false, regarding past social trends and economic growth?

a. Most countries increased their real (i.e. inflation-adjusted) GDP per capita substantially in the 20th century.

b. Some argue that historical increases in real GDP per capita underestimate increases in well-being because price differences don't capture how much better goods and amenities have become.

c. Because of rising global inequality, the share of the world's population in extreme poverty has increased since 1970, despite increasing global GDP.

d. The average life expectancy and educational attainment among women, both in absolute and relative to men, has improved in most countries in recent decades, and is positively correlated with GDP per capita across countries.