Hans Wanted to Rebuild or Improve the Theory on Adjustment

Multiple Choice

Hans wanted to rebuild or improve the theory on adjustment to retirement.In his research,he gave particular attention to all the ways in which observations conflict with theories,based on a sound knowledge of the literature in this area.Which approach did he use?

A) ethnomethodology
B) grounded theory
C) case studies
D) the extended case method
E) participatory action approach