Which One of the Following Is the Best Example of Critical

Which one of the following is the best example of critical thinking as the textbook defines the term?

A) Lars complains to his teacher, "When the textbook author talks about the importance of recycling, he doesn't explain how the advantages outweigh the disadvantages."
B) Justin says to his friend Victor, "I think I can guess why you're feeling sad today."
C) Muriel asks her teacher, "Why do we have to start school so early in the morning? I have trouble thinking clearly before ten o'clock in the morning."
D) Rachel mumbles to herself as she reads her history book, "Why does the year 1929 sound so familiar? Oh, yes, now I know.That's the year the stock market crashed."