A set of points which satisfy a certain condition is called
A.A locus
B.A circle
C.A triangle
D.None of these

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Hint: We can check the definitions of the terms given in the options. Then we can compare them with the statement given in the question.

Complete step by step answer:

A locus is the collection of all the points whose location satisfies one or more specific conditions. It can be a line, line segment a curve, or a surface
A circle can be defined as a collection of all points in a plane that are at a constant distance from a specific point. The specific point is called the center and the constant distance is called the radius.
A triangle is a polygon with 3 sides. It has 3 sides and 3 angles. Geometrically, it is a shape connecting 3 non-colinear points on a plane.
From the above definitions, we can understand that a locus is the set of points that satisfy a certain condition.
Therefore, the correct answer is option A.

Note: The circle can be defined as a locus that satisfies the condition that the points are equidistant from a fixed point in a plane. A circle is a curve on a plane, a locus can be a curve or a surface.