The correct answer is C. Tourists in Mexico enjoy eating the rich, delicious food.
Step-by-step explanation:
In grammar, the use of the comma is appropriate in specific cases this includes separating different elements that belong to a list, enclosing non-essential information, marking introductory phrases, separating adjectives, among others. Additionally, the comma should never separate the subject from the verb in a sentence or the different parts that composed a verb. Considering this, in the case of the sentence "Tourists in Mexico enjoy eating the rich delicious food" the use of the comma is appropriate and correct between the adjectives "rich" and "delicious. Also, it is not necessary to add any other comma. Therefore the sentence that is correctly punctuated is "Tourists in Mexico enjoy eating the rich, delicious food".