Answer:
b. the killing of Trayvon Martin by George Zimmerman
Explanation:
The "Black Lives Matter" movement formed by Alicia Garza, Patrisse Cullors, and Opal Tometi developed in response to the killing of Trayvon Martin by George Zimmerman. Â After the acquittal of George Zimmerman for the killing of Trayvon Martins, the black lives matter movement sprang into a frenzy of online protest with the black live matters hashtags, there has been subsequent protest against the extrajudicial killing of black suspects by police force since its formation.