Final answer:
The correct answer is C. importa.
Explanation:
The correct answer is C. importa.
In the sentence, 'Mi padre está a dieta; le quince libras por perder,' the verb 'importa' agrees with 'quince libras,' which is a singular noun. Therefore, the correct form is 'importa,' making the complete sentence 'Mi padre está a dieta; le importa quince libras por perder.'
Learn more about Spanish language grammar here:
https://brainly.com/question/41347006
