I might be wrong, but I think the error is the way they spelled okay. When you are writing in an essay or any other forms of writing, I think you’re supposed to spell the word out instead of abbreviating it.
I hope this helps :)
Answer:
B. medium, unless its windy no force needed
Explanation:
Hi, I'd sat that the correct answer is B. A cannot be correct, because the simple subject would be "dinosaurs", whereas the complete subject is "large and small dinosaurs", they don't match. C is a similar case - simple subject is "detectives", whereas the complete subject would be "detectives Homer Fry and Janine Small:. In D - simple subject is "crocodiles", whereas the complete subject is "crocodiles, quiet as logs". That leaves us with only one solution - "Cory" is both a simple and a complete subject.