Correct answer:
vengo
Vengo is the conjugation of the verb venir for the first person singular in the simple present tense. The simple present is used when talking about habitual actions or routines. So yo is the subject pronoun that matches the first person singular. The other words also comes from the verb venir in the simple present but venis matches vosotros, viene matches él/ella/ud and vienes matches tú. Finally:
Yo vengo en taxi (I come by taxi)