Question

how did frederick douglass demonstrate civic mindedness?
helped fight for the american colonies independence
warned the colonial militia that they were in danger of attack
helped enslaved african americans escape to freedom
fought against slavery and supported suffrage for african americans

Explanation:

Frederick Douglass was an abolitionist and advocate for civil rights. Helping fight for American colonies' independence was before his time (he was active later, and that was for the American Revolution, not his work). Warning colonial militia is not related to his efforts. Helping enslaved escape was part of the Underground Railroad but more about direct escape, while his civic - mindedness was broader in fighting against slavery and for African American suffrage (right to vote), which is about civil rights and civic participation in the political and social sphere.

Answer:

D. Fought against slavery and supported suffrage for African Americans