Could someone give me an explanation for b) and c)?

b) is TRUE

c) is FALSE

I'd like to know the reason for each answer.

A9. Consider the long-run data on real wage growth and unemployment rates in the figure and select the correct statement(s). Long-run unemployment and real wage growth across the OECD (1970-2011). 4.5 4.0 3.5 3.0 . FIN . SPA 2.5 . NOR DEY FRA . DNK (average annual growth rate, 1970-2011) Real wage growth * JPN . UK BEL 2.0 ITA *SWENLD 1.5 1.0 * USA . CAN 0.5 0.0 N 6 8 10 12 14 16 18 Unemployment rate (average annual rate, 1970-2011) a) A policymaker who values wage growth above all else would have vertical indifference curves. F horizontal b) Positively sloped indifference curves with the most favoured point in the north-west would reflect a policymaker's preferences who valued both real wage growth and low unemployment. c) The preferences of a Spanish policymaker would go through the point labelled 'SPA'. F