The structures that annelids use are palps, antennae, eyes, statocysts, nuchal organs and lateral organs.
I hope this helps.
The answer to this question is option B for sure.
The correction option is VENTILATE THE AREA.
In order to reduce indoor air pollution, the best thing to do is to ventilate the area. Ventilation involves provision of fresh air into a room in order to flush out and eliminate indoor pollution.