GAAP stands for Generally Accepted Accounting Principles. It is a set of rules and standards that companies follow while preparing their financial statements, such as the balance sheet and profit and loss account. US GAAP is simply the version of these rules followed in the United States. Let's check the options.
So US GAAP is a framework of accounting rules and disclosure practices, which makes "accounting practices" the right answer.
Let's summarize:
The answer is option (2).