You are out on the water. you do not understand what another boater intends to do. what sound signal should you make?

One prolonged blast followed by two short blast at intervals of two minutes.

Explanation:

Sound signals that are used in the water are similar to the light indicator signal which is used in the roads. They are a form of communication with each other whether be it road or in water.

     Sound signals that are used in water consists of both short and prolong blasts which can be audible from a distance mile.

      When I am in water and fails to understand what the other boater tries to do, I will give the sound signals which will allow him to locate my boat so that we can avoid any collisions. The signal goes as follows:

One prolonged blast followed by two short blast at intervals of two minutes.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.