When in fruit fly development does axes development begin?

Question

in the unfertilized egg stage when maternal effect genes deposit mRNA and proteins in specific locations

in the early embryo stage when induction signals between neighboring cells identify where the cells are in three-dimensional space

in the larval stage when body segments appear, and pattern formation is evident

in the pupal stage when a gradient of morphogens is established

Answer 1

The correct answer is: in the early embryo stage when induction signals between neighboring cells identify where the cells are in three-dimensional space.