Which of the Following Distinguishes Insects from Other Arthropods

Which of the following distinguishes insects from other arthropods?

A) Insect Ubx promotes the expression of Distal-less, whereas the Ubx of other arthropods has no effect on Distal-less expression.
B) Insect Ubx inhibits the expression of Distal-less, whereas the Ubx of other arthropods has no effect on Distal-less expression.
C) Insect distal-less promotes the expression of Ubx, whereas the Distal-less of other arthropods has no effect on Ubx expression.
D) Insect distal-less inhibits the expression of Ubx, whereas the Distal-less of other arthropods has no effect on Ubx expression.
E) Insect distal-less promotes the expression of Ubx, whereas the Distal-less of other arthropods inhibits Ubx expression.