challenge: What is the function of the dynactin complex in cellular processes?
  
  A. Involved in a diverse array of cellular functions, including ER-to-Golgi transport, lysosome and endosome movement, spindle formation, and nuclear positioning
  B. Only involved in axonogenesis
  C. Only involved in spindle formation and chromosome movement
  D. Only involved in ER-to-Golgi transport
  Answer: 