(C) The structural formula of crotonaldehyde is $CH_3-CH=CH-CHO$.Numbering the carbon chain starting from the aldehyde group $(-CHO)$ as carbon-$1$,we

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(C) The structural formula of crotonaldehyde is $CH_3-CH=CH-CHO$.Numbering the carbon chain starting from the aldehyde group $(-CHO)$ as carbon-$1$,we get:$CH_3(4)-CH(3)=CH(2)-CHO(1)$.Since there are $4$ carbon atoms,the parent alkane is butane. The double bond is at position $2$,and the aldehyde group is at position $1$. Therefore,the $IUPAC$ name is but-$2$-en-$1$-al.