(d) C

Explanation:

Deficiency of vitamin C (which is necessary for collagen production and iron absorption) causes scurvy. It is characterised by bleeding of gums, disturbance of protein metabolism and increased susceptibility to infections.

Scurvy is most frequently seen in order, malnourished adults. Scurvy commonly is associated with sailors in the 16th to 18th centuries who navigated long voyages without enough vitamin C frequently perished from the condition.

Deficiency of vitamin A, B and E results in xeropthalmia, beri-beri and miscarriage respectively.