**Core Concept**
Pasteurella multocida is a Gram-negative, facultatively anaerobic bacterium commonly found in the oral cavity of various animals, particularly cats and dogs. It is a zoonotic pathogen that can cause infections in humans, primarily through animal bites and scratches.

**Why the Correct Answer is Right**
The most common mode of transmission of Pasteurella multocida is through animal bites and scratches, particularly from cats and dogs. This is because the bacterium resides in the oral cavity of these animals and is released into the wound during the biting or scratching process. The bacteria can then enter the human body through the wound, leading to infection.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a common mode of transmission of Pasteurella multocida.
**Option B:** While Pasteurella multocida can be found in other animals, such as birds and rabbits, animal bites and scratches are still the most common mode of transmission to humans.
**Option C:** Ingestion of contaminated food or water is not a common mode of transmission of Pasteurella multocida.

**Clinical Pearl / High-Yield Fact**
It's essential to note that Pasteurella multocida infections can be severe, especially in individuals with compromised immune systems. Therefore, prompt medical attention is necessary if you suspect an animal bite or scratch.

**Correct Answer: C. Contact with infected animals.**