The Figure Below Details an Experiment to Determine If Paramecia

Multiple Choice

The figure below details an experiment to determine if Paramecia digest food in an acidic environment. What can you hypothesize about why the vacuole color returns to red?

A) The pH returns to a basic environment due to increasing proton concentration.
B) The pH returns to a basic environment due to a decreasing proton concentration.
C) The dye from all food vacuoles coalesces into one vesicle destined for exocytosis.
D) All of the above might explain why the vacuole returns to a red color.
E) None of the above are plausible explanations.