Final answer:
The correct option is B. To find the ending balance of accrued salaries payable, subtract the cash paid from the accumulated salary expense during the year. In this case, the ending balance is $30,000.
Step-by-step explanation:
To determine the ending balance of accrued salaries payable, we need to consider the changes that occurred during the year. The beginning balance of accrued salaries payable was $40,000, and the salary expense during 2014 was $420,000.
This means that $420,000 of salaries were earned by employees during the year but were not yet paid. Additionally, $390,000 in cash was paid for salaries during the year. To find the ending balance, we can subtract the cash paid from the accumulated expense: $420,000 - $390,000 = $30,000.