２、手話はいつからあるでしょう？
When did "sign language" start?

�@　約２５０年前
about 250 years ago　

�A　約４５０年前
about 450 years ago

�B　約１５０年前
about 150 years ago

�C　約３５０年前
about 350 years ago

�D　約９９９年前
about 999 years ago