Identify the starting material that would be used to form the following product in a ring-closing metathesis reaction utilizing a Grubbs catalyst?

Question

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The product shown is a cycloalkene, suggesting that a ring-closing metathesis reaction was used to form it. Grubbs catalysts are commonly used in such reactions. The starting material that would produce this product is III, which has a suitable tether for ring closure. The other options either have no tether or a tether that is too short or long for ring closure.

Identify the Starting Material That Would Be Used to Form