Which of these statements would be most important to include in an objective summary of the article? (a)smartphone companies are searching for new ways to innovate and new services to provide to improve sales. (b) smartphones with screens that unfold like a wallet to increase display size are a sure way to build consumer excitement. (c) the top models of phones made by apple and samsung are available for ridiculous prices of more than $1,000. (d) apple's shares dropped 10 percent in stock market value after the company announced that it expects to sell fewer phones.

A because the explanation is perfectly on point

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.