The correct answer is: a) Doabs.
A doab is a landform that is formed when two rivers meet and their floodplains merge. Doabs are typically flat and fertile, and they are often used for agriculture. The word “doab” comes from the Persian word “doab”, which means “between two rivers”.
The alluvial deposits of Punjab’s rivers have created doabs because the rivers have deposited sediment at their confluences. This sediment has built up over time to form the flat, fertile landforms that are characteristic of doabs.
The other options are incorrect because they do not describe the landforms that are created by the alluvial deposits of Punjab’s rivers. Canyons are deep, narrow valleys that are carved out by rivers. Plateaus are large, flat areas of land that are elevated above the surrounding area. Escarpments are steep cliffs that form where two landforms meet.