Identify the Compound A) 1,2 -Dimethylcyclopentene
B) 5 -Methyl-2-Hexyne
C) 3,3-Dimethyl-1-Pentyne
D) 4,4-Dimethyl-1-Pentyne

Identify the compound:
$\mathrm { C } _ { 7 } \mathrm { H } _ { 12 } : \text { IR } \left( \mathrm { cm } ^ { - 1 } \right) : 3300,2950,2220 ; {}^{13} \mathrm { C } \text { NMR: } 5 \text { signals }$

A) 1,2 -dimethylcyclopentene
B) 5 -methyl-2-hexyne
C) 3,3-dimethyl-1-pentyne
D) 4,4-dimethyl-1-pentyne
E) 2,4-dimethyl-2-pentene