OFFICIAL EXPLANATION
Advertisement banners in the air balloon competition last year received so much more exposure than the ads on sports cars in the countryside rally race, owned by the same company, that the company had to invest more in marketing the car ads as well as bundle banners and car ads into a single package.(A) that the company had to invest more in marketing the car ads as well as bundle banners and car ads into a single package
This answer choice is stylistically flawed. Using as well as instead of and is redundant.(B) so that the company had to invest more in marketing the car ads and bundle banners as well as car ads into a single package
While this answer choice corrects one of the two original redundancies, it repeats the other: using as well as instead of and is redundant.
Furthermore, this answer choice does not fit into the original sentence as a result of the addition of the word so in the beginning of the underlined part. The correct construction is so X that Y and not so X so that Y.(C) that the company had to invest more in marketing the car ads and bundle banners and car ads into a single package
This answer choice corrects the original redundancy issue by simply replacing the wordy as well as with the concise and. No further adjustments are necessary in this sentence, and indeed none were made.(D) as to forcing the company to invest in marketing the car ads as much as in bundling banners and car ads into a single package
This answer choice is grammatically incorrect. The construction so x as to y is incorrect.
Also, this answer choice changes the meaning of the original sentence. In the original sentence, the addition phrase as well as is used to connect between two actions the company had to carry out (invest and bundle):
invest as well as bundle = invest + bundle
In this answer choice, as well as is replaced by as much as, which denotes a comparison between the two objects of the verb invest, namely, marketing and bundling.(E) that the company had to invest in marketing the car ads as much as in bundling banners and car ads into a single package
This answer choice changes the meaning of the original sentence. In the original sentence, the addition phrase as well as is used to connect between two actions the company had to carry out (invest and bundle):
invest as well as bundle = invest + bundle
In this answer choice, as well as is replaced by as much as, which denotes a comparison between the two objects of the verb invest, namely, marketing and bundling.I havea confusion here. Someone please help with this.
Because we are bundling banners and car ads into one and they together are part of the list.
Without comma the sentence seems a little awkward.