You are carrying cargoes of crotonaldehyde, phosphoric acid, and morpholine on your multiple-product tankship. Which of the following statements is TRUE?

A
Each of the cargoes must be segregated from the other by at least two barriers.
B
The minimum protective clothing required for taking samples of phosphoric acid is goggles or a face shield.
C
Aluminum, copper, and zinc are prohibited in all valve parts in contact with these cargoes.
D
The required warning sign must have the legend "cancer hazard" added to it.
E