## Core Concept
The question tests the management of acute hypoglycemic reactions, specifically the appropriate treatment to alleviate symptoms. Hypoglycemia is a condition characterized by abnormally low blood glucose levels, often occurring in diabetic patients due to excess insulin or oral hypoglycemic medications.

## Why the Correct Answer is Right
The correct approach to treating hypoglycemia involves administering a rapid-acting source of glucose to quickly elevate blood glucose levels. The American Diabetes Association recommends using the "15-15 rule" for treating hypoglycemia: consuming 15 grams of fast-acting carbohydrate, waiting 15 minutes, and then rechecking blood glucose levels. If levels remain low, the process is repeated. Among the provided options, **15-20 grams of fast-acting carbohydrate** is a standard recommendation. This can be in the form of glucose tablets, juice, or other quick-acting sources.

## Why Each Wrong Option is Incorrect
- **Option A:** This option might not provide sufficient glucose to effectively treat hypoglycemia, as the amount is less than the recommended 15-20 grams.
- **Option B:** While fruit juice can be a source of quick carbohydrates, specifying "only 4 ounces" might not provide enough carbohydrates to effectively treat hypoglycemia, depending on the juice's sugar content.
- **Option C:** This option might provide too much glucose and could potentially cause hyperglycemia, especially if the patient has diabetes.

## Clinical Pearl / High-Yield Fact
A key point to remember is that once blood glucose levels are stabilized, patients should consume a snack or meal that includes a balance of carbohydrates and protein to prevent recurrence of hypoglycemia. Classic sources for immediate treatment include glucose tablets, gels, or liquids, and foods like crackers with peanut butter or a small candy bar.

## Correct Answer Line
**Correct Answer: D. 15-20 grams of fast-acting carbohydrate.**