Answer:
Here the office manager is the user in the buying center for the bank account.
Explanation:
In this question , where the chair of the board ( of local human society ) selects in which bank , the organization would keep its money but the office manager is the one who is the person who is using the bank account , as he he is the one who is making deposits, writing checks and balancing the accounts etc, so this is the reason why it would not be wrong to call office manager as user in the buying center for the bank account.