Yandex interview multiple choice problem

From here (http://company.yandex.ru/inside/job/java.xml) - it's a mini-web-job-interview for a java developer for a "Russian Yahoo".

I will translate a problem number 2:

Given

interface I { ... }
class A { ... }
abstract class B implements I { }

Create a class C, which inherits the functionality of class A and B

</div>

<input ... >class C extends A implements B { ... }

<input ... >class C extends A, B { ... }

<input ... >class C implements A, I { ... }

<input ... >class C extends A implements I { ... }

<input ... >class C extends A, B implements I { ... }

I think that none of the choices provides a correct answer, only one is close to being correct but not correct in general. Anybody disagrees?
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Update:
Aftera all these discussions, it turns out yandex is not that bad. However, strictly speaking, none of the answers is correct. Only answer 4 will compile, however, it puts C and B into different branches of the inheritance tree so at best C can reproduce functionality of B, but not inherit it.

And, as clever

lafy pointed out, B is empty, so technically C does reproduce the null functionality of B. Or the lack thereof. No inheritance though. Nope.

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