**Core Concept**
Platelet lifespan is influenced by storage conditions and the presence of a platelet-activating factor (PAF) released from the plasma. Platelets in stored blood are typically stored at room temperature and undergo changes that affect their viability and function.

**Why the Correct Answer is Right**
Platelets in stored blood have a limited lifespan, primarily due to the release of PAF, which activates platelets and leads to their premature consumption. Studies have shown that platelet viability decreases significantly after 72 hours of storage, making them less effective in promoting hemostasis. The storage conditions, including temperature and agitation, also contribute to the decline in platelet function. Therefore, platelets in stored blood are generally considered non-viable after 72 hours.

**Why Each Wrong Option is Incorrect**
**Option A:** 24 hours is too short a duration for platelet viability to decline significantly. Platelets can remain functional for up to 24 hours in stored blood under optimal conditions.
**Option B:** 48 hours is still within the acceptable range for platelet storage, and platelets can remain viable for up to 5 days with proper storage conditions.
**Option D:** 96 hours is too long, but not as accurate as the correct answer. While platelet viability does decline after 72 hours, some studies suggest that platelets can remain functional for up to 5-7 days with advanced storage conditions.

**Clinical Pearl / High-Yield Fact**
The storage of platelets in blood products is crucial for maintaining their viability and function. The use of platelet-rich plasma (PRP) or platelet-rich fibrin (PRF) can help extend the shelf life of platelets in storage.

**✓ Correct Answer: C. 72 hours**