Colons MEC English 2A [M] (Prescriptive) / 3.Mechanics
3. Which sentence is punctuated correctly?
Within minutes of hearing the news, we had raced home, sure enough, our friends had just arrived and were waiting for us.
Within minutes of hearing the news, we had raced home; sure enough, our friends had just arrived and were waiting for us.
Within minutes of hearing the news, we had raced home. sure enough, our friends had just arrived and were waiting for us.
Within minutes of hearing the news, we had raced home sure enough, our friends had just arrived and were waiting for us.

Within minutes of hearing the news, we had raced home. sure enough, our friends had just arrived and were waiting for us.

Explanation:

the third option, the one with a comma after news, period after home, another comma after enough, and then finally a period.

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.