Please give me the correct answer. Only answer if you're very good at English. Please don't put a link to a website.​

I am pretty positive its the last one, "How computer viruses can be prevented"

Explanation:

Computer Viruses are the problem, and how they can be prevented is the solution

I feel like "How computer viruses can be prevented" is correct.

Explanation:

Computer viruses are a problem, and prevention is a solution

Hope I Helped, have a Nice Day!

            -Aadi x

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.

in what passage i'm sorry but i don't see anything there.