The correct answer is: a) Plains.
Shisham and Kikar are both deciduous trees that are native to the Indian subcontinent. They are found in a variety of habitats, including forests, grasslands, and scrublands. In Punjab, they are most commonly found in the plains, which are the flat, fertile land that covers most of the state.
The Shivalik Hills are a mountain range that runs along the northern border of Punjab. They are home to a variety of plant and animal life, but Shisham and Kikar are not among them. The desert fringes are the areas of Punjab that border the Thar Desert. They are characterized by their hot, dry climate and sparse vegetation. Shisham and Kikar are not found in these areas either. Wetlands are areas of land that are saturated with water. They are home to a variety of plants and animals, but Shisham and Kikar are not among them.
In conclusion, Shisham and Kikar are found in the plains of Punjab. The Shivalik Hills, desert fringes, and wetlands are not suitable habitats for these trees.