As you have read the stories, what about the ones written in third person makes them more difficult to read? It is more difficult to understand the plot points.
The reader has to keep very careful track of the characters
It is harder to understand the language.
The reader has to look closely at the beliefs of the characters.

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.

its a hard situation i cant really answer because the essay is for you to write.