In a Highly Competitive Business Environment of Today Companies Spend

In a highly competitive business environment of today companies spend large amounts of money on marketing to increase their customer base and sadly they do not make efforts to increase employee happiness or satisfaction.

A) to increase their customer base and sadly they do
B) to increase their customer base, for sadly they do
C) to increase their customer base, but sadly they do
D) to increase their customer base, sadly they do
E) to increase their customer base that sadly they do