Final answer:
The correct entry to record the sale of the subscriptions in January is option B) Cash 1,350,000 Unearned Subscription Revenue 1,350,000.
Step-by-step explanation:
The correct entry to record the sale of the subscriptions in January is option B) Cash 1,350,000 Unearned Subscription Revenue 1,350,000.
This is because when the subscriptions are sold, the company receives cash and the revenue is unearned at this point because the magazines have not been published yet.
Therefore, the cash received is debited (increased) and the unearned subscription revenue is credited (increased) to reflect the sale.