Read the instruction carefully. In most cases, you need I-864,
Affidavit of Support, not just a bank statement:
https://www.uscis.gov/system/files_force/files/form/i-485instr.pdf
Affidavit of Support, not just a bank statement:
https://www.uscis.gov/system/files_force/files/form/i-485instr.pdf