A man walked \(20\mathrm{m}\) to cross a rectangular field diagonal...

A man walked \(20\mathrm{m}\) to cross a rectangular field diagonally. If the length of the field is \(16\mathrm{m}\), the breadth of the field is

A. \(4\mathrm{m}\)

B. \(16\mathrm{m}\)

C. \(12\mathrm{m}\)

D. cannot be determined