Men are more suited to occupational environments ______require decisive action while women are better at jobs ______ a considered approach is most important.
A.which; thatB.不填; whenC.which; whenD.that; where在线课程D
解析：
考查定语从句。第一个定从的先行词是occupational environments，在定从中作主语，关系代词可以是which或that；
第二个定从先行词是jobs，在定从中作地点状语，用where。所以选D。