Final answer:
To open a bank account, you typically need a valid ID and proof of address. Pets, basketballs, or library cards are not required for this process.
Step-by-step explanation:
When opening a bank account, the typical items you would bring include a valid government-issued ID, such as a driver's license or passport, and proof of address, such as a utility bill or lease agreement. The correct answer to the question is A) A valid ID and proof of address. This ensures the bank can verify your identity and meet regulatory requirements for opening an account. Carrying a pet, a basketball, or a library card would not be necessary or relevant when opening a bank account.