The main idea of "What Price Glory?" is that busy executives-

A - need more time to do their jobs well

B - need to work more efficiently

C - need to balance their home and office lives

D - should change careers

The correct answer is C) need to balance their home and office lives. As Len Lewis states, modern-day executives must take care of both their personal and professional lives by finding a balance. Moreover, this is shown in paragraph 5:

"Adding richness to daily life by striking a balance between home and office is the essence of a successful businessperson."