Consider the substituents on the following nine carbon chains, what are their common names and IUPAC names?
(I)   (ii)  

• A. (i) common name: neopentylIUPAC name: 2,2-methylpropyl(ii) common name: isobutylIUPAC name: 2-methylpropyl
• B. (i) common name: tertbutylIUPAC name: 2-methylpropyl(ii) common name: isopropylIUPAC name: 2,2-methylethyl
• C. (i) common name: neopentylIUPAC name: 2,2-dimethylpropyl(ii) common name: isobutylIUPAC name: 2-methylpropyl
• D. (i) common name: neopentylIUPAC name: 2-methylpropyl(ii) common name: isobutylIUPAC name: 2,2-methylpropyl

Answer: (C)