The nuclear cross-section is measured in barn, it is equal to

• A. \[{{10}^{-20}}{{m}^{2}}\]
• B. \[{{10}^{-30}}{{m}^{2}}\]
• C. \[{{10}^{-28}}{{m}^{2}}\]
• D. \[{{10}^{-14}}{{m}^{2}}\]