If auxin was not present in a developing plant cell, which of the following would most likely ...

If auxin was not present in a developing plant cell, which of the following would most likely occur?
A) It would trigger activation of MONOPTEROS and other regulatory factors specific to cells in the developing hypocotyls.
B) It would trigger activation of MONOPTEROS and other regulatory factors specific to cells in the developing cotyledons.
C) It would trigger activation of MONOPTEROS and other regulatory factors specific to cells in the developing root apical meristem.
D)  It would trigger activation of MONOPTEROS and other regulatory factors specific to cells in the developing shoot apical meristem.