Answer :
Final answer:
The question is about selecting the correct verb form to agree with the subject in a sentence.
Explanation:
The correct verb to use in this sentence: is
In this sentence, the verb 'is' should be used because it agrees with the subject 'Ella,' which is singular third person. Therefore, the sentence should be: 'Ella trabaja mucho y está cansada.'
Examples of subject-verb agreement:
- 'She is happy.'
- 'They are tired.'
Learn more about Subject-verb agreement in English sentences here:
https://brainly.com/question/46430131