On September 1, 2012, Gold Magazine Sold 400 One-Year Subscriptions $\quad 36,000$

On September 1, 2012, Gold Magazine sold 400 one-year subscriptions for $90 each. The total amount received was credited to Unearned Revenue. What would be the required adjusting entry at December 31, 2012?

A) Unearned Revenue $\quad 36,000$
Service Revenue $\quad$ 36,000
B) Service Revenue $\quad 24,000$
Unearned Revenue $\quad$$\quad$ 24,000
C) Unearned Revenue $\quad 24,000$
Service Revenue $\quad$$\quad$ 24,000
D) $$\begin{array}{l}\text { Unearned Revenue } \quad 12,000\\\text { Service Revenue } \quad 12,000\end{array}$$