A beekeeper notices that her bee population is declining rapidly. Upon further study, she notices that there are no queen bees present in her population. She suspects this is due to exposure to an environmental agent. Which of the following could be a possible mechanism for the environmental agent?

A. The environmental agent is a methyltransferase enzyme that acts on genes that encode queen bee characteristics.
B. The environmental agent mimics a Dnmt3 siRNA.
C. The environmental agent inhibits Drmt3.
D. The environmental agent causes royal jelly to be produced in abnormally high amounts.