Answer:
Humor is the correct answer.
Step-by-step explanation:
For this question, the concept humor is very important, particularly its rhetorical definition:
Humor is a rhetorical device that causes laughs on the audience, or at least it tries to provoque laughter. There are many purposes for using this tool; one of them is to engage an audience by breaking monotony and making the audience feel more comfortable. In this case, Andrew Blum used it to engage readers, so option A is the answer.