What two famous actresses from the 30s were rumored to have an affair?

Question: What two famous actresses from the 30s were rumored to have an affair?

Choices:

Jean Harlow and Bette Davis
Bette Davis and Marlene Dietrich
Joan Crawford and Greta Garbo
Greta Garbo and Marlene Dietrich

Correct answer:

Greta Garbo and Marlene Dietrich