Nutrient rich blood from the digestive organs must be drained by
a. splanchnic circulation
b. the celiac circulation
c. the hepatic portal circulation
d. veins of the mesentery

The correct answer is option C. hepatic portal system.

Explanation:

The hepatic portal system involves hepatic portal veins and its accessory tributaries. The hepatic portal system collects blood from digestive organs and spleens that consist of nutrients absorbed from these organs and circulate to the liver.

This system is unique to circulate both oxygenated and deoxygenated blood. This system involves most of the digestive organs from the esophagus to the end of the canal.

Thus, the correct answer is option c. the hepatic portal circulation.  

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