The Crew of an Eighteenth Century Ship Sailing from Asia $\beta$

Multiple Choice

The crew of an eighteenth century ship sailing from Asia has eaten mostly rice during the voyage. Some of the crew members start experiencing vision difficulties and an increased susceptibility to infection. The most likely cause of these symptoms is a deficiency in

A) vitamin B₁₂.
B) vitamin C.
C) $\beta$ -carotene.
D) glyphosate.
E) oblimersen.