Since Jack's overall content on his paper is weak, than that means that the overall ideas in his essay were not full developed. He needs to complete his essay with more information and be more detailed.
Your answer is: C) The overall ideas in his essay were not fully developed
I believe the answer would be C. It says that his overall essay was weak so that must mean that the content inside of it hasn't been fully developed enough yet to make a strong essay.
The sentence that has illogical comparison is the second example - A parrot's feathers are more colorful than a parakeet. It should be ... than a parakeet's.
