**Concept:** **The question tests on the basics of Probability**

**Solution:**

Probability = Favorable Outcomes / Total Outcomes

Favorable Outcomes = Dart hits the shaded area = 4 * π * r2r2 = 36π

Total Outcome = Area of the square region = 24 * 24 = 576

The Required Probability = 36π / 576 = π/16**Option A**