The employment to population ratio have been increasing in most developed economies over the last 30 years. Which one of the following statements is not a proper explanation for that? 1) increase in female labour participation 2) technological change 3)increase in inflation rate 4) changes in social norms 5) changes in discrimination Select one: a. only 3 O b. 2 and 4 O c. only 4 d. 4 and 5 O e. 2, 3 and 4