From the following list of observations, choose the one that most clearly supports the following conclusion: a) emission spectrum of hydrogen b) the photoelectric effect c) scattering of alpha particles by metal foil d) diffraction electromagnetic radiation has wave characteristics.

for points guys

i believe the answer is true.

it was spontaneous.

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.