What did some feel was a key problem with the Fifteenth Amendment?

It did not extend voting rights to women.

It only allowed freed slaves to vote.

It did not extend voting rights to those without property.

It only allowed those in certain states to vote.

4 answers

The Fifteenth Amendment (Amendment XV) to the United States Constitution prohibits the federal government and each state from denying a citizen the right to vote based on that citizen's "race, color, or previous condition of servitude."

That should tell you.
Thank you!
Just for fun, to add on to @PsyDAG('s) answer, let me say this:

The 15th Amendment granting African American men the right to vote was adopted into the U.S. Constitution in 1870. Despite the amendment, by the late 1870s discriminatory practices were used to prevent Black citizens from exercising their right to vote, especially in the South. It wasn’t until the Voting Rights Act of 1965 that legal barriers were outlawed at the state and local levels if they denied African Americans their right to vote under the 15th Amendment."
Also, The 15th Amendment granting African American men the right to vote was adopted into the U.S. Constitution in 1870. Despite the amendment, by the late 1870s discriminatory practices were used to prevent Black citizens from exercising their right to vote, especially in the South. It wasn’t until the Voting Rights Act of 1965 that legal barriers were outlawed at the state and local levels if they denied African Americans their right to vote under the 15th Amendment."

So, what is the answer?
By now, you should know!
Hope this helped, and PsyDAG('s) answer, of course. :)
Sites:
History.com
Sorry I didn't see this sooner I'm not on here that much but thank you to so much for your help!