Step 1: Define "immigrants" in this context. In the context of internal migration within India, "immigrants" refers to people who migrate into a state from other states.
Step 2: Identify pull factors for migration. The primary pull factor for inter-state migration is economic opportunity.
Step 3: Analyze the given states. Maharashtra, with major urban and industrial centers like Mumbai and Pune, is a major economic hub that attracts a vast number of migrants from across the country in search of jobs and better livelihoods. States like Bihar are typically source states (net out-migration), not destination states.