Final answer:
The correct verb conjugation is 'manejas'
Step-by-step explanation:
The correct verb conjugation for the sentence "¿Con cuánta frecuencia _____ (manejar)?" in the 'tu' form is option C. 'manejas'.
For example, in a complete sentence, you would say '¿Con cuánta frecuencia manejas?' which translates to 'How often do you drive?'.
Learn more about Verb conjugation in Spanish