super() in a diamond

QuizMediumPython onlyAsked in: Accenture, TCS

What does print(D().hi()) print?

class A:
    def hi(self): return "A"
class B(A):
    def hi(self): return "B" + super().hi()
class C(A):
    def hi(self): return "C" + super().hi()
class D(B, C):
    pass

BCA
BA
BACA
TypeError: ambiguous inheritance

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