Which of the following reactions gives `H_(2)C=C=C=CH_(2)`
A. `CH_(2)Br-CBr=CH_(2)overset(Zn//CH_(3)OH)to`
B. `HC-=C-CH_(2)-COOHunderset(40^(@)C)overset(Aq.K_(2)CO_(3))to`
C. `CH_(2)Br-C-=C-CH_(2)Brunderset("Heat")overset(Zn)to`
D. `2CH_(2)=CH-CH_(2)-Ito`
