What Did the "Second Important Expansion" of the Franchise Entail

Multiple Choice

What did the "second important expansion" of the franchise entail and when did it happen?

A) Universal white male suffrage during the Jacksonian Democracy of the 1830s
B) The 15th Amendment's expansion of the franchise to black men in 1870
C) The 19th Amendment's expansion of suffrage to women in 1920
D) The 26th Amendment's expansion of the electorate to young people in 1971