The basic functions of the Public Accounts Committee (PAC) are to scrutinize and examine various financial statements and accounts. Option 1 states that the PAC is responsible for examining the statement of accounts showing the income and expenditure of state corporations, trading and manufacturing schemes, and projects. This means that the PAC reviews the financial records of these entities to ensure transparency and accountability. Option 2, which mentions examining the accounts of stores and stocks, and option 3, which refers to examining the statement of accounts of autonomous bodies, are not included in the basic functions of the PAC. Therefore, the correct answer is option 1. It is important to note that while options 2 and 3 might be tasks performed by the PAC, they are not considered as part of the basic functions.