The correct answer is B. 1500 units.

Complete equivalent units in current period is calculated by the following formula:

Complete equivalent units in current period = Beginning work in process equivalent units + Work done in current period equivalent units - Ending work in process equivalent units

In this case, we have:

Complete equivalent units in current period = 2500 units + 3800 units - 5000 units = 1500 units

Option A is incorrect because it is the total equivalent units in current period, which is calculated by the following formula:

Total equivalent units in current period = Beginning work in process equivalent units + Work done in current period equivalent units

In this case, we have:

Total equivalent units in current period = 2500 units + 3800 units = 6300 units

Option C is incorrect because it is the equivalent units of ending work in process, which is calculated by the following formula:

Equivalent units of ending work in process = Ending work in process equivalent units

In this case, we have:

Equivalent units of ending work in process = 5000 units

Option D is incorrect because it is the equivalent units of work done in current period, which is calculated by the following formula:

Equivalent units of work done in current period = Work done in current period equivalent units

In this case, we have:

Equivalent units of work done in current period = 3800 units