Which of the following quotes from Mark Twain has a serious tone?

The quotes are:

“Age is an issue of mind over matter. If you don’t mind, it doesn’t matter.”

“Get your facts first, then you can distort them as you please.”

“Courage is resistance to fear, mystery of fear, not absence of fear.”

“The coldest winter I ever spent was a summer in San Francisco.”

The serious quote is: “Courage is resistance to fear, mystery of fear, not absence of fear.”

Explanation: yw! :⊃

a question like this requires the excerpt to be included in order to answer the question.

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.