The correct answer is A (3,800). Under accrual accounting, if reported revenue exceeds the cash collected, it typically results in an increase in accounts receivable. The formula to calculate cash collected from customers is:

$$\text{Cash collected from customers} = \text{Revenue} - \text{Increase in accounts receivable}$$

Substituting the given values:

$$\text{Cash collected from customers} = 5,000 - 1,200 = 3,800$$

Option B (5,000) is incorrect because it equals the revenue, ignoring the increase in accounts receivable. Option C (6,200) is incorrect as it adds the increase in accounts receivable to revenue, which is not the correct approach.