**Final Answer:**
The accrued salaries at December 31, Year 4, according to the general journal. Therefore, the correct answer is option 1) $1,500.
**Explanation:**
Accrued salaries represent the amount of salaries owed but not yet paid. To calculate the accrued salaries at December 31, Year 4, you would need to consider any salaries that were earned but not paid by the end of the accounting period.
Assuming that the salaries accrue evenly throughout the year, you can estimate the accrued salaries by taking the total annual salaries expense and prorating it for the portion of the year that corresponds to the accrual period.
For example, if the annual salaries expense is $18,000 and the accounting period is a calendar year, the accrued salaries at December 31 would be calculated as follows:
\[ \text{Accrued Salaries} = \left( \frac{\text{Total Salaries}}{\text{Number of Months in a Year}} \right) \times \text{Number of Months Accrued} \]
Substituting in the values:
\[ \text{Accrued Salaries} = \left( \frac{18,000}{12} \right) \times 1 = $1,500 \]
Therefore, the accrued salaries at December 31, Year 4, are $1,500. This amount represents the portion of salaries that has been earned by employees but has not yet been paid by the end of the accounting period.