Which option fails?

Given:

Which option fails?
A. Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100);
B. Foo<String, String> pair = Foo.<String>twice ("Hello World!");
C. Foo<Object, Object> percentage = new Foo<String, Integer>("Steve", 100);
D. Foo<String, String> grade = new Foo <> ("John", "A");

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