The correct answer is: A. House sewer
A house sewer is a pipe that conveys sewage from the plumbing system of a single building to a common sewer or point of immediate disposal. It is typically made of PVC, ABS, or cast iron and is buried underground. The diameter of a house sewer varies depending on the size of the building and the amount of sewage it generates.
A lateral sewer is a pipe that connects the house sewer to the main sewer. It is typically made of PVC or ABS and is buried underground. The diameter of a lateral sewer varies depending on the size of the house and the amount of sewage it generates.
A main sewer is a large pipe that collects sewage from all of the houses in a neighborhood and carries it to a treatment plant. It is typically made of concrete or steel and is buried underground. The diameter of a main sewer varies depending on the size of the neighborhood and the amount of sewage it generates.
A sub-main sewer is a smaller pipe that connects the main sewer to the lateral sewers. It is typically made of PVC or ABS and is buried underground. The diameter of a sub-main sewer varies depending on the size of the neighborhood and the amount of sewage it generates.