Answer:
b. In the evening, Brad and I often go out to dinner.
Explanation:
The sentence should be in simple present as it is talking about a habit or repetitition. Because of that, the verb go should be in his simple present form. Also, the subject is Brad and I which means US and most verbs in simple present for the first person plural use the root form. So, in this case, it would be: Brand and I often go out to dinner.