Answer:
A. increase in the ledger cash account balance (book balance)
Step-by-step explanation:
The bank collected $1500 from the customer on behalf of the company. The amount was posted to the customer's account, increasing the company's bank balance by $1500. When the bank generates the customer's statement, the collected amount will reflect in the customer statement increasing it by $1500.
To reconcile the customer bank statements, and the customer's ledger, the amount of $1500 will have to be added to the customer's cash balance.