The correct answer is option 'C' - Egypt.

The Khamsin wind is a local wind that occurs in Egypt. It is a hot, dry, and dusty wind that blows from the south or southeast. The word "Khamsin" means fifty in Arabic, which refers to the approximate number of days this wind blows.

Below are some key points explaining the Khamsin wind in Egypt:

1. Definition: The Khamsin wind is a hot, dry, and dusty wind that originates in the Sahara Desert and blows across Egypt.

2. Season: The Khamsin wind typically occurs during the spring season, between March and May. It is characterized by its high temperatures and low humidity.

3. Duration: The Khamsin wind usually lasts for about 50 days, hence its name. However, the exact duration can vary from year to year.

4. Causes: The Khamsin wind is primarily caused by the difference in atmospheric pressure between the Mediterranean Sea and the Sahara Desert. As a result, the wind blows from the south or southeast towards the north.

5. Characteristics: The Khamsin wind is known for its high temperatures, often exceeding 40 degrees Celsius (104 degrees Fahrenheit). It carries large amounts of dust and sand, reducing visibility and creating hazy conditions. The wind can also cause sandstorms in some areas.

6. Impact: The Khamsin wind has both positive and negative impacts. On the positive side, it helps in dispersing pollutants and clearing the atmosphere. It also plays a vital role in agriculture by depositing nutrient-rich dust on farmlands. However, the wind can also cause respiratory problems and damage to crops, particularly if it is accompanied by sandstorms.

In conclusion, the Khamsin wind is a local wind that occurs in Egypt. It is a hot, dry, and dusty wind that blows from the south or southeast, primarily during the spring season. The wind has significant effects on the climate, agriculture, and environment of the region.