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Answer is A
No you wouldn't need if you change from List to Map and then use keySet(), but I think the answer is still B, because in theory there could be more than 50k Accounts...
You would still need a for loop to add the account ids in a set
The answer is B
The answer must be A. We can add the account ids into a set and then instead of for loop we can directly do a query to contacts and the set of ids in the where clause.
select id from contact where accounts in setIds