The argument we get looks like this:
Parents directly experience which methods are successful on their own children
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Parents should not necessarily raise their children in a way experts recommend
There seems to be this tension between knowing your own kid and following advice of experts. So the correct answer will have something to do with knowing X better than the experts know X, and thus justifying not always listening to the experts.
(A) This is kind of close but it doesn't mention the experts and "matter of taste" is not exactly the same as familiarity.
(B) This is the opposite of what we want. We shouldn't always listen to the experts because they don't cater to the specific individual, not the average individual.
(C) This is perfect. Because the experts are not familiar with this particular mountain, one may not need to listen to the experts' advice when the climber is familiar.
(D) This is the opposite. We want to undermine the experts' advice, not strengthen it!
(E) What about the experts?