下列物质中,互为同分异构体的是()
①CH3CH2CH2CH2CH3②(CH3)2CHCH2CH2CH3③CH3CH2CH2CH(CH3)CH3
④CH3CH2CH(CH3)CH3⑤CH3CH2CH(CH3)CH2CH3.
A.①④⑤
B.③⑤
C.②④⑤
D.③④