Control Account Reconcilation

Which of the following is the reason for carrying out a trade receivables ledger reconciliation?

(A) To check that the balance on a customer’s ledger account agrees with the supplier account balance in the customer’s books
(B) To check for indications that the balance on the general ledger control account is incorrect
(C) To check that the value of sales is correctly recorded in the general ledger
(D) To check there is no cash outstanding from customers
The answer is “B”. Shouldn’t it be correct rather than incorrect. I mean it is typo or it is right if we say incorrect?