The correct answer is option 'C' - late monsoon. Let's explore why the hillsides are lush during this time.

The Monsoon Season
The monsoon season is characterized by heavy rainfall in many parts of the world, including regions like India. It plays a crucial role in determining the vegetation and overall landscape of a place. The monsoon season in India typically lasts from June to September.

Impact of Monsoon on Hillsides
During the monsoon season, the hillsides receive abundant rainfall, which is essential for the growth of vegetation. The hills act as catchment areas, collecting the rainwater and allowing it to seep into the soil. This water then nourishes the plants and trees, leading to lush greenery.

Early Monsoon
In the early monsoon, the hillsides may not be as lush because the rainwater takes some time to penetrate the soil and reach the plant roots. The initial rainfall may also cause some erosion, washing away the topsoil and making it difficult for plants to grow.

Mid Monsoon
As the monsoon progresses, the hillsides become greener and more vibrant. The rainwater has now seeped into the soil, providing the necessary moisture for plant growth. The plants start to sprout, and flowers begin to bloom, adding color to the landscape.

Late Monsoon
By the late monsoon, the hillsides are at their peak of lushness. The continuous rainfall has saturated the soil, resulting in a favorable environment for vegetation. The plants have grown taller, and the flowers are in full bloom, creating a picturesque view.

End of Monsoon
As the monsoon season comes to an end, the rainfall gradually decreases. The hillsides may start to lose their lushness as the soil dries up and the plants receive less water. The flowers may begin to wither, and the greenery may fade away.

Conclusion
In conclusion, the hillsides are lush during the late monsoon because this is when the rainfall has adequately saturated the soil, allowing for robust plant growth. The plants are tall and healthy, and the flowers are in full bloom, creating a beautiful and vibrant landscape.