What is FALSE concerning the use of unicellular plastic foam work vests on small passenger vessels? (small passenger vessel regulations)

Correct Answer: Option B — They may be substituted for up to 50% of the required life jackets.

Work vests are intended for use by crew members while working over the side and are not substitutes for life jackets. 46 CFR 117.70 prohibits using work vests to meet the required life jacket count, as they do not provide the same level of buoyancy or protection as approved life jackets.