Which among the following are unsaturated hydrocarbons? (i) \[{{H}_{3}}C-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\] (ii) \[{{H}_{3}}C-C\equiv C-C{{H}_{3}}\] (iii) \[{{H}_{3}}C-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-C{{H}_{3}}\] (iv) \[{{H}_{3}}C-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,=C{{H}_{2}}\]

• A.  (i) and (iii)                    
• B.  (ii) and (iii)
• C.  (ii) and (iv)            
• D.         (iii) and (iv)