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Determine whether the conjecture is true or false. Give a counterexample for any false conjecture.

Given: a concave polygon
Conjecture: It can be regular or irregular.

A. False; a concave polygon has an odd number of sides.
B. False; to be concave the angles cannot be congruent.
C. False; all concave polygons are regular.
D. True

Step-by-step explanation:

The answer is B flase

two points in the interior does not lies completely within the figure.

A is false, you can build a concave polygon with any number of sides. Moreover, regular polygons can have both an even or odd number of sides.

B is true: concave polygons have at least one octuse angle, and regular polygon can't have octuse angles.

C is false: there are no regular, concave polygons

D is false