**Core Concept**
Enteroviruses are a group of viruses that primarily affect the gastrointestinal tract and are known for their ability to spread through various routes. The correct mode of spread is crucial for understanding the epidemiology and prevention of enteroviral infections.

**Why the Correct Answer is Right**
Enteroviruses are highly contagious and spread through the fecal-oral route, where the virus is ingested through contaminated food or water or through direct contact with an infected person's feces. This mode of transmission is facilitated by the virus's ability to survive on surfaces and in the environment for extended periods. The virus can also be spread through respiratory droplets, but the primary mode of transmission is through fecal contamination.

**Why Each Wrong Option is Incorrect**
**Option A:** Fomite transmission is a possible mode of transmission, but it is not the primary mode of spread for enteroviruses. Fomites are inanimate objects that can carry the virus, but the virus's primary mode of transmission is through fecal contamination.
**Option B:** Respiratory droplets can spread enteroviruses, but this is not the primary mode of transmission. The virus is primarily spread through fecal contamination.
**Option C:** Blood transfusion is not a mode of transmission for enteroviruses. These viruses are primarily spread through fecal contamination and respiratory droplets.

**Clinical Pearl / High-Yield Fact**
It's essential to emphasize proper hand hygiene and sanitation practices to prevent the spread of enteroviruses, particularly in healthcare settings where the virus can spread quickly among vulnerable populations.

**Correct Answer: D. Fecal-oral route**