that was () surprised all of usa.which b.what要原因

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that was () surprised all of us
a.which b.what
要原因

That was WHAT surprised all of us --------没有指代,就用what.
==That was SOMETHING THAT surprised all of us -------如果有了something,就用that指代.
== 比如说:That was Tom's decision THAT / WHICH surprised all of us -------that / which指代Tom's decision.

B ……的人/东西/地方

B what在表语从句中作主语

B
表语从句,后面的的从句那缺少主语,,而which 不可以代替主语只能用what

两个答案都不通
可以勉强用 b what

a