How does the author feel about the solutions to problem of robocalls?

参考解析：

推理判断题。根据第一段第三句至第五句“We are finally waking up to the severity of the problem by supporting and developing a group of tools, apps and approaches intended to prevent scammers from getting through. Unfortunately, it's too little, too late. By the time these ‘solutions (解决方案)’ become widely available, scammers will have moved onto cleverer means.”可知，我们认识到了问题的严重性，支持和开发了旨在防止欺诈者通过的工具、应用程序和方法，。不幸的是，我们的努力太少了，也太晚了。在这些“解决方案”被广泛使用的时候，骗子将转移到更巧妙的手段上。由此可推知，作者认为这些“解决办法”对于解决问题起不了什么作用，因此作者感到很“失望”。故选D。