The tour was cancelled on account of incessant rain.

constant
heavy
intermittent
unexpected

The correct answer is A. constant.

Incessant rain is rain that falls continuously for a long period of time. It is often used to describe heavy rain that does not stop. The other options are not as accurate descriptions of incessant rain.

  • Heavy rain is rain that falls heavily, but it may not fall continuously.
  • Intermittent rain is rain that falls for short periods of time, with breaks in between.
  • Unexpected rain is rain that falls when it is not expected.

Incessant rain can cause a number of problems, including flooding, landslides, and power outages. It can also make it difficult to travel and can damage crops.