**Core Concept**
The use of thrombolytics in acute myocardial infarction (AMI) is based on the principle of rapidly restoring blood flow to the affected myocardium, thereby reducing infarct size and improving outcomes. **Thrombolytic therapy** works by dissolving the occluding thrombus in the coronary artery. The timing of administration is crucial for its effectiveness.

**Why the Correct Answer is Right**
The correct answer is related to the time frame within which thrombolytic therapy is most effective. The sooner thrombolytics are administered after the onset of AMI symptoms, the better the outcome. This is because the amount of salvageable myocardium decreases as time elapses.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct time frame.
**Option B:** Similarly, this option is also incorrect as it does not provide the accurate time frame for thrombolytic administration.
**Option D:** This option is incorrect because it suggests a time frame that is too late for optimal benefit from thrombolytic therapy.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the benefit of thrombolytic therapy is time-dependent, with the greatest reduction in mortality seen when treatment is initiated within a specific time frame after symptom onset.

**Correct Answer:** C. 6 hours