According to Code

This choice is incomplete as it lacks a specific measurement. While it introduces the topic of minimum size, it does not provide the necessary detail to determine the correct answer. Therefore, it cannot be considered a valid option.

This option underestimates the minimum size requirement set by the code. A 2-inch pipe would not meet the specified standards for pipe C, potentially leading to inadequate flow capacity and compliance issues. Hence, it is not an acceptable choice.

A 1 1/2-inch pipe is significantly below the required minimum size according to the code. Such a dimension would not facilitate proper flow rates and could result in operational inefficiencies or safety hazards, making this option incorrect.

Similarly, a 1 1/4-inch pipe also fails to meet the minimum size requirement. This size is insufficient for the intended application of pipe C and would not comply with the code, rendering this choice incorrect as well.