Which type of channel of distribution is most likely to be typical of specialized, highly variable products such as adventure holidays?

Agreed to option C, it your own product/service you should be better off in representing your product. But most important fact to consider is to train your staff on regular basis, this where at time most company starts to suffer at competitive advantage in long run.

b) Direct sale from tour operator to consumer

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b) Direct sale from tour operator to consumer..............................

b)>>>>>>>> Direct sale from tour operator to consumer

Thanks for invitation , 

agree with option   b