Which molecular interaction is crucial for early posterior determination in the Drosophila egg?

Question

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a
Interaction between nurse cells and the oocyte

b
Interaction between terminal follicle cells and the oocyte

c
Interaction between Gurken and Torpedo proteins

d
Interaction between Bicoid and Hunchback proteins

e
There is no early posterior signal in Drosophila egg

Answer 1

b
Interaction between terminal follicle cells and the oocyte