Final answer:
The phrase that means 'I say no!' in Spanish is ¡Digo que no!
Step-by-step explanation:
The phrase that means 'I say no!' in Spanish is ¡Digo que no! (Option A). This phrase is a direct translation of the English phrase 'I say no.' Here, digo means 'I say' and que no means 'no.'
Learn more about Spanish phrases for expressing refusal