What figure results from rotating the triangle 360°?

Triangle ABC is shown.

What three-dimensional figure results from rotating the triangle 360° about segment AC ?
A.)  cone
B.)  cylinder
C.)  pyramid
​D.)  sphere

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Think of grabbing onto the figure at B, and rotating it in a circle, while segment AC stays exactly where it is.  What 
figure would be formed from the rotation?

​A.)  cone

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