Answer:
Taste aversion.
Explanation:
Taste aversion is the phenomena by which the individual develops the toxic or poisonous against the substance. The sickness and nausea are common in the taste aversion.
Rita and Dmitri eats donuts but after taking a ride, Dimitri feels nauseous and regurgitates the donuts. Dmitri has developed the taste aversion because they have developed the taste aversion against the donuts. The taste aversion develops the nausea and illness after eating the donuts.
Thus, the correct answer is option (A).