The product of the following reaction is:

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(B) The given reaction is a Claisen rearrangement,which is a $[3,3]$-sigmatropic rearrangement of an allyl aryl ether.In this reaction,the allyl group

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(B) The given reaction is a Claisen rearrangement,which is a $[3,3]$-sigmatropic rearrangement of an allyl aryl ether.In this reaction,the allyl group migrates to the ortho position of the phenol ring.The mechanism involves a cyclic transition state where the carbon atom marked with an asterisk $(^*)$ in the allyl group becomes attached to the ortho position of the benzene ring.Therefore,the product is a phenol with the allyl group attached at the ortho position,where the carbon atom originally attached to the oxygen is now attached to the ring,and the terminal carbon $(^*)$ remains at the end of the allyl chain.Thus,the correct structure is a phenol with a $-CH_2-CH=CH_2^*$ group at the ortho position.

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