I'm stuck with the question given by my teacher, what do you think the best answer is? Since they're all doesn't suit to put as conjunctions in this sentence.
The correct answer is (A).
"otherwise", in this context, means:
In circumstances different from those present or considered; or else.
Should we apply this definition to the sentence, it would come to mean that Baxter is affordable enough for enterprises that would not have enough money to purchase any packing/sorting robot other than Baxter.
As an example, let's say NPP Packaging Company only has $500 to spend on a new packaging robot, but every single robot of this kind on the market costs $800 or more. Therefore, NPP could not afford to purchase a packaging robot due to their limited budget.
A few days later, however, Baxter the sorting/packaging robot is released to the market and is priced at $450, which fits NPP's budget of $500. This allows the company to purchase a packaging robot, in contrast to a few days earlier when they could not afford any robots of this type.
Therefore, Baxter allows companies with budget constraints (such as NPP) to buy a robot that packs and sorts - the type of robot that used to be too expensive for them.