The conclusion "developing an all-consuming hobby is not a successful strategy for overcoming adolescent loneliness" is drawn based on a what-if hypothesis: "if they lose interest in that hobby, their loneliness may be exacerbated." This argument assumes that "if a strategy for overcoming adolescent loneliness ever intensifies that loneliness", then "it is not a successful strategy". B paraphrase this assumption. Alternatively, you can also try "deny test".
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