Alex was fired from his previous position because of a personal conflict with a superior. Which answer provides a plausible and positive spin on the situation?

a) "I've learned to identify problems sooner. I like your open communications style and think it will help."
b) "The supervisor never said anything. I don't know why I was fired."
c) "I had to miss a few weeks of work to solve some personal issues. It won't happen again."
d) "My supervisor was a nice person but not really reliable. He was just doing what his boss told him."