Arcs

We can eliminate C and D since they are irrelevant to the generation of the arcs.

I read that it's going to be more episodic and have fewer arcs.

Using the space agency's X-ray telescope, the researchers saw two arcs of gas with a thin layer of relatively cool hydrogen gas.

If a curvilinear triangle has for its sides arcs of circles which if produced would cut orthogonally the fundamental plane, the sum of the angles of this curvilinear triangle will be less than two right angles.