Which of the following forms is used for reporting budget expenditures?

The use of the NAVCOMP form 2157 is specifically designated for reporting budget expenditures within Navy operations. This form is essential for financial accountability and allows for effective tracking of expenditures against budget allocations. By utilizing this form, financial officers can ensure that all spending aligns with the authorized budget and can report variances as needed.

The other forms mentioned are utilized for different purposes. OPNAV form 4790/2K is associated with reporting maintenance and repair activities for equipment. Standard Form 94 is used for reporting statements of witness, which is not related to budget reporting. The Support Equipment Transaction Report is focused on tracking inventory and status of support equipment, rather than budget expenditures. Therefore, NAVCOMP form 2157 is the correct choice for budget expenditure reporting.