Light travels as rays which are parallel. When light travels from a source, it propagates in the form of rays, which are straight lines that represent the path of light. These rays can be classified into three categories based on their behavior: divergent, convergent, and parallel.

1. Divergent rays:
Divergent rays are rays of light that spread out in different directions from a single point. They diverge or move away from each other as they travel through a medium. This occurs when light passes through a convex lens or when it reflects off a concave mirror. Divergent rays have a tendency to spread out and do not meet at a point.

2. Convergent rays:
Convergent rays are rays of light that come together or meet at a point. They converge towards a focal point or focus. This occurs when light passes through a concave lens or reflects off a convex mirror. Convergent rays have a tendency to come together and meet at a point.

3. Parallel rays:
Parallel rays are rays of light that remain parallel to each other as they travel through a medium. They do not converge or diverge. This occurs when light passes through a plane mirror or travels through a medium with a uniform refractive index. Parallel rays maintain their parallel nature throughout their propagation.

The correct answer, in this case, is option 'C' - parallel. When light travels from a source, it typically propagates as parallel rays. This means that the rays of light remain parallel to each other and do not converge or diverge. They maintain their parallel nature as they travel through a medium.

It is important to note that while light may initially be parallel, it can be subjected to various optical phenomena, such as refraction, reflection, and diffraction, which can cause the rays to converge or diverge. However, in the context of the question, the statement holds true that light travels as parallel rays from a source.