It is possible. Income inequality in topic 3 and inequality (in topic 1?) are slightly different topics.i highly doubt this will be asked tbh; income inequality was assessed last year
It might just be one of those curveball questions that bostes likes to use. (but if you've prepared for all the topics mentioned already I think you should be set since you have 2 options each essay).
Always account for the in your face curveball questions