The correct answer is: the meaning of "solidarity".
Explanation:
The purpose of the shop meetings during the shirtwaist (blouse) strike (1909), also known as "Uprising of 20,000", was primarily to raise awareness on the need for solidarity to these women's cause (Yiddish-speaking immigrants). Leaders of the strike such as Clara Lemlich became known to the outside world in mass meetings. They spoke about the intolerable working conditions these women in the clothing industries were suffering (<em>long work hours, low wages and crowded factories, among others</em>) and that people needed to understand the meaning of solidarity, that is, to be sympathetic to their hard struggle. People reacted positively and voted for a general strike.
