These are some good questions,
siddharthkapoor. I will respond in-line below.
siddharthkapoor
1. Why is "less" is used instead of "fewer". Isn't the then noun "trans-fats" countable?
No,
trans-fats is not used in a countable way in the sentence above. You can count
grams of trans-fats, but in the context of the sentence, we are simply being informed about a type of fat rather than a quantity. Think of the word as
fat on its own:
consume 20 percent less fat is appropriate;
consume 20 percent fewer fat is not, unless we were to add a countable noun after our current noun, as in
fat calories (thereby turning
fat into an adjective).
siddharthkapoor
2. Why is the usage of "has" is incorrect?
The problem with
has is that it does not touch upon the conditional if-then relationship that the latter two-thirds of the sentence shifts into. This is why you should pay attention to the non-underlined portion of the sentence as well as what you may need to fix. That is,
in order to significantly reduce indicates a hypothetical outcome to the
if condition presented in the middle portion: if the average male
were to consume 20 percent less trans-fats
than he does currently.
Has to is more definitive, like the advice a doctor might give directly to a patient ("
You have to... or else...").
siddharthkapoor
3. In option B, is there an error because in it just "to" is used instead of "in order to"?
No,
to is simply a shortened version of
in order to and serves in the same capacity. One is an adverb on its own, the other an adverbial phrase.
I hope that helps clarify your concerns. If you have further questions, feel free to ask. Good luck with your studies.
- Andrew