Which one of the following angles should be added to \[\mathbf{3}{{\mathbf{0}}^{{}^\circ }}\] such that the sum becomes a straight angle?

• A. \[{{90}^{{}^\circ }}\]                        
• B. \[{{100}^{{}^\circ }}\]         
• C. \[{{120}^{{}^\circ }}\]                       
• D. \[{{150}^{{}^\circ }}\]
• E. None of these