Answer: When a company uses the allowance method of accounting for uncollectible receivables, the entry to reinstate a previously written off account would include: "C. A debit to Allowance for Doubtful Accounts".
Explanation: Registration would be: Debit to "Allowance for Doubtful Accounts" and Credit to "Accounts Receivable".
Example:
--------------------------------------- . -----------------------------------
Allowance for Doubtful Accounts 100
Accounts Receivable 100
--------------------------------------- . ------------------------------------