This structure shows a section of a polymer chain formed from the random polymerisation of two different monomers.

Which pair of monomers could produce this polymer?
CH2=CH2\text{CH}_2=\text{CH}_2CH2=CH2 and CH(CN)=CHCH3\text{CH(CN)}=\text{CHCH}_3CH(CN)=CHCH3
CH2=CHCN\text{CH}_2=\text{CHCN}CH2=CHCN and CH2=CHCH3\text{CH}_2=\text{CHCH}_3CH2=CHCH3
CH2=CH2\text{CH}_2=\text{CH}_2CH2=CH2 and CH2=CHCN\text{CH}_2=\text{CHCN}CH2=CHCN
CH2=CHCH3\text{CH}_2=\text{CHCH}_3CH2=CHCH3 and CHCN=CHCN\text{CHCN}=\text{CHCN}CHCN=CHCN