**Core Concept**
In cases of liver injuries, the management strategy depends on the severity and location of the injury. A liver laceration that does not involve major vessels or the bile ducts, and does not cause significant bleeding, can be managed conservatively. This approach aims to monitor the patient closely for signs of bleeding or complications, while avoiding unnecessary surgical intervention.

**Why the Correct Answer is Right**
The described liver laceration is 1 cm deep and extends from the dome more than halfway through the parenchyma, but it is not specified to involve major vessels or the bile ducts. A conservative approach is appropriate because it allows the liver to heal on its own, reduces the risk of complications associated with surgery, and avoids the potential for bleeding. The patient's stable vital signs (pulse rate of 80/min and BP of 110/70 mmHg) also support a conservative management strategy.

**Why Each Wrong Option is Incorrect**

* **Option B:** Abdominal exploration and packing of hepatic wounds would be indicated in cases of severe liver injuries with significant bleeding that cannot be controlled with conservative management. However, in this scenario, the patient's stable vital signs and the nature of the liver laceration do not necessitate surgical intervention.
* **Option C:** Ligation of the left hepatic artery would be a procedure of last resort, typically reserved for cases where there is significant bleeding from a major hepatic artery injury. Since the liver laceration is not specified to involve the hepatic artery, this option is not indicated.
* **Option D:** Left hepatectomy would be an overly aggressive approach for a 1 cm deep liver laceration that does not involve major vessels or the bile ducts. This option would be considered in cases of severe liver trauma with significant bleeding or parenchymal damage that cannot be managed with conservative treatment or less invasive surgical procedures.

**Clinical Pearl / High-Yield Fact**
In cases of liver injuries, the "hemostatic triangle" is a useful concept to remember. This refers to the area between the midline of the body, the inferior border of the liver, and the left costal margin. Injuries within this triangle are more likely to be associated with significant bleeding and may require more aggressive management.

**✓ Correct Answer: A. Conservative treatment**