The Hox Genes Came to Regulate Each of the Following

Multiple Choice

The Hox genes came to regulate each of the following in what sequence, from earliest to most recent?
1) identity and position of paired appendages in protostome embryos
2) anterior-posterior orientation of segments in protostome embryos
3) positioning of tentacles in cnidarians
4) anterior-posterior orientation in vertebrate embryos

A) 4 → 1 → 3 → 2
B) 4 → 2 → 3 → 1
C) 4 → 2 → 1 → 3
D) 3 → 2 → 1 → 4
E) 3 → 4 → 1 → 2