Several employees of Company X believe that the reason

[BTGmoderatorDC]

Several employees of Company X believe that the reason that sales are alarmingly declining is that the design department knows little about marketing and strategy.

A. that sales are alarmingly declining is that the design department knows little about marketing and strategy
B. that sales are alarmingly declining is because the design department knows little about marketing and strategy
C. for the alarming decline in sales is that the design department knows little about marketing and strategy
D. that sales are alarmingly declining is that the design department knows little about marketing as well as strategy
E. that sales are declining alarmingly is that the design departments knows little about strategy and marketing

[deloitte247]

OPTION A: NOT TRUE
This option remains a vague approach to answering questions. Suggestions could be inferred to mean a "copy and paste" without grammatical dissection which would not matter. Hence it is not applicable

OPTION B: NOT TRUE
The statement sounds and appears grammatically correct but for its lack in modernness devoid of complex structure in language formation.

OPTION C: TRUE
This option sounds and appear to be most grammatically correct, apt, short and simple with concise illustration from the inferred statement.

OPTION D : NOT TRUE
Sounds and appears more like the option B but for the archaic usage of "because" which weakens the composition strength of the statement.

OPTION E: NOT TRUE
The construction of the sentence makes it a bit more difficult to discern.