Final answer:
The correct verb form to complete the sentence is 'celebremos'.
Step-by-step explanation:
The correct verb form to complete the sentence is C. celebremos.
In this sentence, the subject is 'nosotros' (we) which requires the verb form 'celebremos'. The other options 'celebramos' (we celebrate) and 'celebran' (they celebrate) do not agree with the subject. Therefore, the correct answer is 'celebremos'.
For example: 'No es cierto que nosotros celebremos esta festividad.' (It is not true that we celebrate this holiday.)
Learn more about Spanish verb conjugation