The larger the area of forest is destroyed, .......
A. the most frequent natural disasters are
B. the most frequently natural disasters occur
C. the more frequent are natural disasters
D. the more frequently natural disasters occur
Which option is the best to fill in the blank?
It's obvious that D is correct, but when it comes to inversion in comparative sentences, I can't rule out the option C.
Are there two equally good answer to that question?
I see that the only correct choice here is "D". It is the correct word order for this structure: (the + comparative expression + subject + verb).
BTW, Using 'is' in your question above seems to me ungrammatical.