Final answer:
The correct answer is 'has' as the verb 'have' is used in the present simple tense for habitual actions.
Step-by-step explanation:
In this case, the correct answer would be 'has' because the verb 'have' is being used as a base form in the present simple tense. The sentence states that she 'has' a bath every evening, which is a habitual action. The present continuous tense is used to describe actions happening at the moment or in the near future.
Learn more about present simple tense