GWD 4-39, 请教了，谢谢

Q39.

Unearthed in China, fossils of feathered dinosaurs offer
the most dramatic evidence yet discovered of the close evolutionary
relationship between dinosaurs and birds.

1. offer
        the most dramatic evidence yet discovered of the close evolutionary relationship
        between dinosaurs and birds
2. offer
        evidence more dramatic than what has yet been discovered of the close
        evolutionary relationship between dinosaurs and birds
3. offer
        more dramatic evidence of the close evolutionary relationship than any yet
        discovered between dinosaurs and birds
4. have
        offered the most dramatic evidence of the close evolutionary relationship
        between dinosaurs and birds that have yet been discovered
5. have
        offered more dramatic evidence than any that has yet been discovered of
        the close evolutionary relationship between dinosaurs and birds