What statement is true concerning the vent pipes and sounding tubes associated with a vented tank?

Correct Answer: Option B — The vent pipe attaches to and ends at an opening at the top of the tank, and the sounding tube passes through the tank top and extends almost to the tank bottom.

Vent pipes must terminate at the top of the tank to allow air or vapor displacement during filling. Sounding tubes must extend to the bottom of the tank to provide a consistent reference point for measuring liquid depth, ensuring accurate tank gauging as required by 46 CFR regulations.