ANS:B - steel

The most suitable material of construction for a sewer to carry sewage under high pressure is steel. Steel is often preferred for sewer construction in situations where high pressure is a concern. This is because steel pipes offer excellent strength, durability, and resistance to pressure, making them well-suited for handling high-pressure sewage flow. Additionally, steel pipes can withstand the corrosive effects of sewage and are relatively easy to install and maintain. While materials such as asbestos cement, cement concrete, and stoneware may also be used for sewer construction, they are typically more suitable for low-pressure applications or gravity-flow systems. Steel, on the other hand, is specifically designed to withstand high pressures and is commonly used in pressurized sewer systems where the sewage needs to be transported under significant pressure.