Movement into and out of cells — practice question

When living pancreatic cells were put into a solution containing the red dye neutral red, the cytoplasm turned red. The cells were then taken out of the neutral red solution. The red dye in the cytoplasm then passed into vesicles, which were released from the cell, so that the cell eventually became colourless. Which transport mechanisms could account for the red dye entering and leaving the cells?

• Aactive transport and facilitated diffusion
• Bdiffusion and exocytosis
• Cfacilitated diffusion and endocytosis
• Dosmosis and exocytosis