Which plot device is illustrated by this diagram?
a. parallel
b. episodic
c. flashback
d. in media res

The correct answer is B.

The plot device used in this illustration is episodic.

An Episodic plot is a composed of series events, which are usually one chapter long, that are related to each other.

Each chapter has its rising action, which is somehow related with the next and previous chapters. All of this events are tied by a common theme and/or characters.

you need need more details so we can understand what your asking us.

"a" because he is appealing to logic as oppose to appealing to the audience's emotions.