The statement, "Landform A is a mountain and Landform B is a karst landform " is correct.
Explanation:
Landform A is known as “Plateau” and Landform B is known as “Karst”
A plateau is a plain, high landscape that rises dramatically on at least one side across the surrounding region. On each and every continent, there are plateaus and a quarter of the Earth's land. We are among the four main territories, hills, plains, and rivers.
Karst is one of the world's most unusual ecosystems, but its distinctive landforms are characteristic too. Also on the surface and below the surface are these characteristic types of soil.
Caves consist of the limestone breakdown. Rainwater absorbs carbon dioxide out of the atmosphere and when percolating into a soft acid through the soil. The calcareous columns, bedding planes, and cracks are gradually removed, some of which are expanded as well as cellars.