Which one is a run-on sentence? a. insufficient funds prevented them from launching another costly missile. b. mr. smith thoroughly enjoys his solitary life in the country. c. i hear a sad tune it bothers me. d. if you soak seeds before planting, they will germinate faster.

Start by reading C

I hear a sad tune it bothers me. That sentence, though short, is still a run on.

You can fix it in a number of ways.

The others are all OK.

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.