This answer should be "c" the top 20%. The income is clearly not middle income level, which would be d or a. It is definitely not b- bottom 20%. Therefore we are left with c- top 20% and this jives with my own experience. 1% would include millionaires and above, therefore we are left with a relatively small group of high income earners who aren't necessarily millionaires- in the sense that they earn a million or more per year.