I believe the correct answer is: A) Dull or unintelligent.
Given that micro is the opposite of macro and it means 'small', while cephalo- means 'head, skull, brain', microcephaly means to have a smaller brain, which would lead to intellectual disability. Macrocephaly, on the other hand, means 'having a large head'.
It depends if you are writing a personal one, a persuasive one, an argumentative one, historical one, etc.
The theme in the Metamorphosis is an irrational or unacceptable event, how Gregor turned into a situation where he can't do anything but to accept the consequences of his actions. It can relate to Kafka's own life where to face the absurd event might be as difficult as Gregor's experience.
