Correct Option: C

An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer. Rectilinear propagation is a wave property which states that waves propagate (move or spread out) in straight lines. This property applies to both transverse and longitudinal as well as an Electromagnetic wave. Even though a wave front may be bent (the waves created by a rock hitting a pond) the individual waves are moving in straight lines.