Who gave The New York Times copies of classified documents on the Vietnam War?

The Umkhonto-we-Sizwe ("Spear of the Nation") was

a. the armed wing of the African National Congress. b. a militant White separatist movement that was later incorporated into the National Party. c. the armed militia of the Zulu homeland that later developed into the Inkantha Freedom Party. d. a militant African separatist group that was later incorporated into the African National Congress. e. the original name of the Pan-Africanist Congress, a more militant offshoot of the African National Congress.

Suppose we want to know what happens to the probability of voting as age increases from 18 to 29, comparing high school dropouts to high school graduates. Which probability test are we going to use?

What will be an ideal response?