What is a major legal requirement for LP gas retailers?

Compliance with state and federal safety regulations is a major legal requirement for LP gas retailers because these regulations are established to ensure the safety of both consumers and the general public. LP gas, being a flammable substance, poses various risks; therefore, adhering to safety standards is crucial to prevent accidents such as leaks, fires, and explosions. Retailers must be knowledgeable about these regulations, which cover aspects such as the proper storage and handling of LP gas, installation procedures, and equipment safety measures. Following these legal requirements not only helps protect the safety of employees and customers but also aids in maintaining the retailer's legal standing and operational license.

The other options do not represent critical legal requirements. Offering discounts does not fall under legal obligations; it's a business strategy. Maintaining a certain level of inventory is more about business efficiency and customer service rather than a legal necessity. Providing free installations may be a marketing tactic, but it's not mandated by law for retailers.