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Banks play a crucial role in economic growth primarily through their function of providing loans and investment products. By lending money to individuals and businesses, banks facilitate access to capital that can be used for various purposes, such as starting new enterprises, expanding existing businesses, or funding personal expenditures. This access to capital is essential for stimulating economic activity, as it enables consumers and businesses to make purchases, invest in innovation, and create jobs.

Additionally, banks often offer various investment products that allow individuals and institutions to save and grow their wealth, which further contributes to economic development. By engaging in these activities, banks help to circulate money within the economy, encouraging spending and investment, which are vital components of economic growth.

In contrast, the other options indicate roles that do not significantly support or enhance economic growth. Accepting deposits only from corporations limits the bank's function to a narrow segment of the economy, while minimizing credit availability and enforcing strict withdrawal limits would directly hinder financial activities and impede growth by restricting access to necessary funds.