请教prep sc-p1-114

114.
            (30583-!-item-!-188;#058&004275)

A study on couples' retirement transitions found that women who took new jobs after retiring from their primary careers reported high marital satisfaction, more than when retiring completely.

(A) more than when retiring

(B) more than if they were to retire

(C) more so than those who retired

(D) which was more so than those retiring

(E) which was more than if they had retired

看了解释也不太明白。more so than 的表达法感觉好怪异。有NN能再解释解释么？

more so than这种表达是存在的，so指"report high marital satisfaction"这种行为

Postcode affects home more so than car insurance.中so指affect home这种行为

I know who I am now more so than ever before. 中so指know who I am