**Core Concept**
The most common mode of transmission of poliovirus is through the fecal-oral route, where the virus is ingested through contaminated food or water. This mode of transmission is facilitated by the poliovirus's ability to survive for extended periods in the environment and its high infectivity.

**Why the Correct Answer is Right**
The correct answer is fecal-oral transmission. This occurs when an individual consumes food or water contaminated with feces containing the poliovirus. The virus then enters the gastrointestinal tract, where it multiplies and causes infection. The fecal-oral route is the primary mode of transmission for poliovirus, accounting for the majority of cases worldwide. The virus can survive for weeks in the environment and can be transmitted through poor hygiene practices, contaminated water sources, or close contact with an infected individual.

**Why Each Wrong Option is Incorrect**
* **Option A:** Not applicable in this context.
* **Option B:** While person-to-person transmission can occur, it is not the most common mode of transmission for poliovirus.
* **Option C:** Not a recognized mode of transmission for poliovirus.

**Clinical Pearl / High-Yield Fact**
The fecal-oral route of transmission is a common mode of transmission for many enteric pathogens, including poliovirus, hepatitis A, and rotavirus. Practicing good hygiene, such as proper handwashing and sanitation, can significantly reduce the risk of transmission through this route.

**Correct Answer: C. Fecal-oral transmission is the most common mode of transmission of poliovirus.**