(C) The structure of the compound is $CH_2=CH-CH=CH-C(=O)OH$. Counting the $\pi$ bonds: $1$. There is one $\pi$ bond in the first $C=C$ double bond. $

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(C) The structure of the compound is $CH_2=CH-CH=CH-C(=O)OH$. Counting the $\pi$ bonds: $1$. There is one $\pi$ bond in the first $C=C$ double bond. $2$. There is one $\pi$ bond in the second $C=C$ double bond. $3$. There is one $\pi$ bond in the $C=O$ double bond of the carboxylic acid group. Total number of $\pi$ bonds = $1 + 1 + 1 = 3$.