Which of the following statements is true concerning an immersion suit and its use?

Correct Answer: Option B — They provide sufficient flotation to do away with the necessity of wearing a life jacket.

Immersion suits are designed to provide both thermal protection and inherent buoyancy. Per 46 CFR 160.171, these suits are approved to provide sufficient flotation to eliminate the need for a separate life jacket, ensuring the wearer remains afloat and protected from hypothermia in cold water environments.