What make the extraordinary elements of the metamorphosis seem realistic and believable?
a. kafka's inclusion of gregor's family
b. kafka's use of a straightforward tone
c. kafka's choice to turn gregor into a bug
d. kafka's previous relationship with his father

B). Kafka's use of a straightforward tone.

Explanation:

'The Metamorphosis' by Franz Kafka is categorized under the genre of 'magical realism' that offers a blend of realistic elements with a touch of magical or supernatural elements that interrogates the dark reality of the modern world with a unique touch.

As per the question, Kafka's extraordinary elements seem realistic and believable as he employs a direct and straightforward tone that accomplishes the author's purpose and succeeds in connecting to the readers. Had Kafka employed a complex element, it would have been difficult for the audience to understand it. Thus, option B is the correct answer.