Which of the following best defines grease in relation to sewage disposal systems?

Grease, in relation to sewage disposal systems, specifically refers to animal fats or vegetable oils that are discharged into the sewage system. This definition highlights the nature of grease as it pertains to residential and commercial waste disposal, particularly in how it is generated from cooking and food preparation processes. When grease enters the sewage system, it can solidify and cause blockages in pipes, leading to serious plumbing issues and potential environmental concerns.

Understanding this specific characterization is crucial for effectively managing and maintaining sewage disposal systems. Grease can accumulate in the system and creates challenges for wastewater treatment facilities that must deal with its presence, often necessitating additional maintenance or treatment processes to ensure proper sewage flow. The other options do not accurately encompass the specific properties and implications of grease within the context of sewage systems, making option B the best definition.