The correct option is C planting and conservation of avenue trees.
The name of Smt. Thimmakka is associated with the planting and conservation of avenue trees (trees or large shrubs lining each side of public roads).
Saalumarada Thimmakka, also known as Aalada Marada Timakka, is an Indian environmentalist from the state of Karnataka, recognised for her work in planting and tending to 385 banyan trees along a four-kilometre stretch of highway between Hulikal and Kudur. She has been awarded with Padma Shri in 2019 for her work.