The answer is Less
I hope this solves your problem :)
B less is the answer
should be the answer
I think it is D because, In English the comparative form of an adjective is usually marked by the suffix-er or the word more Compare positive (sense 10), superlative (sense 2). noun. 4. the comparative form of an adjective. Derived Forms. comparatively, adverb comparativeness, noun.
The correct answer is more complex
The superlative form ends in -est. For instance, clos-est or farth-est.
Hope this helped! Good luck! :)