Sentence Correction

The Marketing Department has adamantly rejected all claims that it was previously aware of the errors due to which sales of the new web-based service have amounted to a mere 1.5 million dollars instead of the expected 9 million dollars.

A. due to which sales of the new web-based service have amounted to a mere
B. which consequently caused sales of the new web-based service to amount to a mere sum of
C. due to which sales of the new web-based service have consequently amounted to a mere
D. due to which sales of the new web-based service have amounted only to a mere
E. that caused sales of the new web-based service to amount only to a sum of

What's wrong with option B?

OA A