Answer: A

Explanation:

You cannot insert AccountHistory records via DML (C is impossible).
Using @IsTest(SeeAllData=true) (D) is discouraged and still won’t help if your org doesn’t already have relevant history for your specific test record.
Deleting the method (B) is not acceptable.
To make the test pass reliably across orgs, abstract your history retrieval and, for unit tests, conditionally return synthetic data when Test.isRunningTest() is true. Example:

public with sharing class AccountHistoryManager {
public static List getAccountHistory(Account acc) {
if (acc == null || acc.Id == null) return new List();

if (Test.isRunningTest()) {
// Return deterministic fake data for tests
AccountHistory fake = (AccountHistory)JSON.deserialize(
'{"AccountId":"' + String.valueOf(acc.Id) + '","Field":"Industry"}',
AccountHistory.class
);
return new List<AccountHistory>{ fake };
}

return [
SELECT Id, AccountId, Field, OldValue, NewValue, CreatedById, CreatedDate
FROM AccountHistory
WHERE AccountId = :acc.Id
ORDER BY CreatedDate DESC
];
}

}...

Answer is D

To make the test pass, @isTest(SeeAllData=true) should be used to allow the test to access historical data from the org. This is required because field history tracking data is not copied to a test context, so you need to allow the test to access live data to assert against it.References: Apex Developer Guide - IsTest Annotation

correct Ans is -
D. Use @isTest (SeeAllData=true] to see historical data from the org and query for Accountdistory records.