Read the following sentence. leonardo da vinci was enthralled by flying, so much so that he sketched flying machines, which were indeed ahead of their time, but if they had been built, they probably never would have flown in real life. what is the main error in this sentence? a. length – the sentence should be broken into separate sentences to be more understandable. b. conciseness – the sentence has too many unnecessary adjectives and adverbs. c. order – this sentence contains misplaced modifiers. d. parallel structure – this sentence is not consistent with how the parts of speech are presented.