When to Use the Present Perfect and the Past Simple

Use ever with the present perfect to ask about a past experience and never to talk about an experience you haven't had. If you add information about time and place, use the past simple. It's now time for a quiz. Which is correct? Number one. I've been for a job interview last week. Or B. I went for a job interviews last week. And it's A. Who has eaten all my biscuits? or B. Who ate all my biscuits?"