C. elegans, a nematode or "round worm," is a model organism in biology. A group of AP biology students was investigating associative learning in C. elegans.
C. elegans feeds on bacteria, a particular strain of E. coli OPI150. For one week, when students added E. coli OPI150 to the nematode culture, they also added salt ($NaCl$). Then, students placed the nematodes on a Petri dish with two choices, one mL of $NaCl$ solution and one mL of water, as seen in the image below.
Which of the following predicts and justifies where the C. elegans will be located after ten minutes in this experiment?