The nucleophile used to react with butyl iodide to form te compound below is :
What is a Nucleophile
A Nucleophile is a molecule in a chemical reaction that seeks for a positive center of the reaction ( i.e. nucleus ) and this is because of the presence of a electron pair in the Nucleophile.
Given the compound expressed in the question the chemical reaction that takes place between the nucleophile and butyl iodide is called Nucleophilic substitution reaction.
Hence we can conclude that the nucleophile that could be used to react with butyl iodide is CH₃CH₂O⁻
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