How does keller use evidence to address the underlined counterclaim? she suggests a hypothetical situation to illustrate how dark life would be without the benefit of optimism. she uses an example from her own life to illustrate why she is able to be optimistic despite her circumstances. she explains the facts of her physical limitations to shed light on the importance of considering pessimism. she cites a quotation from an expert to lend credibility to the idea that pessimism sometimes has its merits.