Which is right?

[DreamFounder]

1.The old doorman believed the reason____,as he found later,the well-dressed lady made up and let her in.
A.when B.why C.which D.for which

2.Such tourists___have visited Shanhai all think that no visit Shanhai can be complete without a stroll along the Bund.
A.who B.that C./ D.as

[Casiopea]

Both sentence are a bit odd, sorry. Did you find them on-line? If so, could you give us the link?