What changes needs to be made to sentence 15?

there is no verb to fill the sentence

Change "has" to "have", because the sentence would still be grammatically correct no matter if you used "not" or "rather than"; so I don't think you should choose the last option.

which of the following was specifically permitted by the emancipation proclamation?

free african americans were allowed to fight for the confederacy.

free african americans were allowed to enlist in the union army and navy.

enslaved people in border states were allowed to move to the north.

enslaved people in border states were allowed to become confederate citizens.

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> the hunger games

> divergent

> caraval

> and i darken (depends on age range)

> strange the dreamer

> red queen

> the grisha trilogy

> six of crows

> the star-touched queen