The correct answer is option 1 only, as coconut shells, groundnut shells, and rice husk are indeed viable feedstocks for biomass gasification due to their availability and high carbon content. In biomass gasification, combustible gases generated include a mix of hydrogen, carbon monoxide, and methane, not just hydrogen and carbon dioxide; this invalidates statement 2. Additionally, the gases produced can be used in internal combustion engines, contrary to statement 3. Thus, only the first statement is correct, highlighting the practicality of using various biomass materials in sustainable energy solutions for India's power crisis.