The sum of \[\angle a\] and \[\angle b\] is \[\text{280 }\!\!{}^\circ\!\!\text{ }\]. What is the value of\[\angle \text{x}\]?

• A.  \[\text{120 }\!\!{}^\circ\!\!\text{ }\]                                     
• B.  \[\text{40 }\!\!{}^\circ\!\!\text{ }\]                       
• C.         \[\text{60 }\!\!{}^\circ\!\!\text{ }\]                       
• D.         \[\text{140 }\!\!{}^\circ\!\!\text{ }\]