**Core Concept**
The sudden deceleration due to slamming on the brakes can cause a type of injury known as abdominal compartment syndrome, particularly affecting organs within the abdominal cavity. This is due to the increased intra-abdominal pressure (IAP) caused by the rapid deceleration force, leading to compression of abdominal organs.

**Why the Correct Answer is Right**
The sudden increase in IAP can cause compression of the abdominal organs, particularly the liver, spleen, and kidneys. The liver is most susceptible to injury due to its fixed position in the upper right quadrant of the abdomen and its relatively large size. The liver's blood supply and venous outflow can be compromised due to the increased pressure, leading to potential hepatic injury. This is often referred to as a "deceleration injury" or "abdominal compression injury."

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the spleen, although also an abdominal organ, is not as likely to be affected as the liver due to its relatively smaller size and more mobile position.
* **Option B:** This option is incorrect because the kidneys, although susceptible to injury, are not as likely to be affected as the liver due to their deeper location in the retroperitoneal space and their relatively smaller size.
* **Option C:** This option is incorrect because the heart is not typically affected by abdominal compartment syndrome, as it is located in the thoracic cavity and is not directly subjected to the increased intra-abdominal pressure.

**Clinical Pearl / High-Yield Fact**
In cases of abdominal compartment syndrome, it is essential to monitor IAP and maintain a low threshold for surgical intervention to prevent organ dysfunction and failure.

**Correct Answer: C. Kidneys**