That clip is from Nanaka 6/17 and it's Yui Horie playing Yuriko Amemiya.
This is a pretty mean question. The character on the picture is Haku from Spirited Away, who can be easily mistaken for Akira Touya from Hikaru no Go. Sanae Kobayashi played Akira Touya, Miyu Irino played Haku.
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That song is an alternate version of the Nadesico Opening. Those 3 seiyuu are all from Nadesico, but since it's an Ruri song you should have clicked Omi Minami.
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That character you hear in the clip is Masami Oyamada from Someday's Dreamers, his seiyuu is Junichi Suwabe and therefore the correct answer to this question.
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It's Shoutarou Morikubo.
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Kyoko Hikami is a few years older than Houko Kuwashima and both have never hosted Voice Crew, thus the right answer is b.
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That song is called 'Uki Uki Taratta', a Pita Ten character song performed by Yukari Tamura.