Invoking Hammonds postulate and the properties of the carbocation intermediates, explain why the doubly allylic alkyl halide

Question:

Invoking Hammond’s postulate and the properties of the carbocation intermediates, explain why the doubly allylic alkyl halide A undergoes much more rapid solvolysis in aqueous acetone than compound B. Then explain why compound C, which is also a doubly allylic alkyl halide, is solvolytically inert. H A Br H Br B H C Br