A good general rule is if you are no longer being polite then it's time to bail. A2c fails on that front, so bail. A2a seems to be pointless unless you think they missed the link, so bail. A2b is okay, though I would suggest asking them directly what they find confusing and then bail if they still show little to no effort. Q3 is clearly time to bail, and may be time for Consideration. Q4 probably deserves to be reaped.