ANS:D - both(b) & (c)

Electrometallurgy is not involved in the extraction of tin and lead from their ores. Aluminum extraction primarily involves the Hall-Héroult process, which is a type of electrometallurgical process. However, tin and lead are typically extracted using pyrometallurgical methods, such as smelting, rather than electrometallurgical processes. So, the correct answer is: both (b) & (c) - tin and lead.