Evidence came up

Evidence came up ____ specific sounds are recognized by babies as young as six months old.

what

that

which

whose

答案及解析：本题考查同位语从句。B选项，句意：有证据表明，小至六个月的婴儿就能识别具体的声音。evidence后面的同位语从句被全句的谓语动词came up隔开，同位语从句须由that引导，所以B项正确。A选项，与题意不符 ，故排除。C选项，which不能引导同位语从句 ，故排除。D选项，与题意不符 ，故排除。故正确答案为B 项。