Why are interfaces preferred to abstract classes?

Question

I recently attended an interview and they asked me the question \"Why Interfaces are preferred over Abstract classes?\"

I tried giving a few answers like:

Answer 1

If they think that X is better than Y I wouldn't be worried about getting the job, I wouldn't like working for someone who forced me to one design over another because they were told interfaces are the best. Both are good depending on the situation, otherwise why did the language choose to add abstract classes? Surely, the language designers are smarter than me.