**A**

To find the answer, we have to divide the area of a circle for bull’s eye by the area of the circle for dart board.

The area of a circle formula is:

A = π * r^{2}

Dart board radius = 18

Bull’s eye radius = 4

**Probability = A _{2}/A_{1} = (π * 4^{2}) / (π * 18^{2}) = 4.94%**

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