**Explanation:**

When two rays meet at a certain point, an angle is formed. Let's explore this in more detail:

**1. Rays:**
- A ray is a part of a line that starts at a particular point and extends indefinitely in one direction.
- It has one endpoint and continues infinitely in the other direction.
- In geometry, rays are represented by drawing a line with an arrowhead on one side to indicate the direction in which it extends.

**2. Intersection:**
- When two rays intersect, it means they meet or cross each other at a specific point.
- The point where the rays meet is called the vertex of the angle.

**3. Angle:**
- An angle is formed when two rays share a common endpoint.
- The common endpoint is the vertex of the angle, and the two rays are the sides of the angle.
- The rays can be named using their endpoints, with the vertex as the middle letter.
- For example, if the rays are AB and AC, and their common endpoint is A, then the angle is denoted as ∠BAC.

**4. Types of Angles:**
- Angles can be classified based on their measure:
- Acute angle: An angle that measures less than 90 degrees.
- Right angle: An angle that measures exactly 90 degrees.
- Obtuse angle: An angle that measures more than 90 degrees but less than 180 degrees.
- Straight angle: An angle that measures exactly 180 degrees.
- Reflex angle: An angle that measures more than 180 degrees but less than 360 degrees.

**Conclusion:**
When two rays meet or intersect at a particular point, an angle is formed. The angle is defined by the two rays, with the common endpoint serving as the vertex. Thus, the correct answer is option 'C' - angle is formed.