Which of the following is an angle that can be constructed using compasses and a ruler?

• A. \[\text{20 }\!\!{}^\circ\!\!\text{ }\]                                        
• B. \[\text{80 }\!\!{}^\circ\!\!\text{ }\]
• C. \[\text{60 }\!\!{}^\circ\!\!\text{ }\]                                          
• D. \[\text{110 }\!\!{}^\circ\!\!\text{ }\]