The correct option is 1 and 2 because the Peninsular Block of India is characterized by both significant tectonic activity and the presence of residual mountain ranges. The western coastal areas have experienced submergence over geological time due to tectonic forces, contributing to its unique coastal morphology. Additionally, residual hills like the Veliconda and Mahendragiri are remnants of ancient mountains, showcasing the region's geological history, while deep, V-shaped valleys indicate characteristics not primarily associated with the Peninsular Block but rather with younger Himalayan terrains. Understanding these features highlights the complex geological evolution of the Indian subcontinent, which is essential for UPSC Prelims.