please help

Compton Computers sold a computer (cost of $3,500) for $6,200 to a customer. The customer paid cash. The sales price included a one-year contract valued at $300. Compton satisfies the first month of the service contract. The journal entry to recognize one month of revenue from the service contract would be A. debit to Uneamed Revenue for $25; credit to Service Revenue for $25 B. debit to Service Revenue for $25 credit to Uneamed Revenue for $25 O A. debit to Unearned Revenue for $25; credit to Service Revenue for $25. O B. debit to Service Revenue for $25; credit to Unearned Revenue for $25. O c. debit to Unearned Revenue for $300; credit to Service Revenue for $300. OD. debit to Service Revenue for $300; credit to Unearned Revenue for $300