Final answer:
The correct verb conjugation is 'ayuda'.
Step-by-step explanation:
The correct verb conjugation to complete the sentence is ayuda. The subject of the sentence is 'Tu papá', which is singular and requires the verb form 'ayuda' (he/she helps). The other options ('ayudo', 'ayudan', 'ayudas') are conjugations for different subjects (I, they, you, respectively) and do not match with the subject of the sentence.
Learn more about Spanish verb conjugation