What could be the best title for the passage?

Câu hỏi: Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.
Human blood comes in four different types, namely A, B, AB and O. In most of the world, most people are ignorant of which blood type they possess, since it is important only if they have to undergo an operation which requires a blood transfusion. In Japan, however, things are different, since a large proportion of the population believes that blood type determines personality and, as a result, over 90% of the population are aware which type they are.
This linking of blood type and personality has ramifications across life, but is especially prominent in prospective relationships and employment. For example, in Japan one popular way to meet romantic partners is to go to specialised venues which conduct speed dating. A single man and woman sit alone together at a table for just a few minutes. Then a bell rings, and they go to sit with someone new. Some such venues hold dating sessions which are limited to men or women of a particular blood type. For those who believe in the blood-type theory, this seems to maximise their chance of finding someone special.
The current popularity of the idea exploded in the 1970s following the publication of a book by Masahiko Nomi, even though he was a lawyer and broadcaster who had no medical or psychological training. His ideas were largely anecdotal, and many critics thought it mere superstition, but the book nevertheless sparked great interest in the general public. Now his son, Toshitaka, continues to promote the theory, and nowadays it is ubiquitous in Japanese popular culture, featuring on morning TV, women’s magazines and best-selling self-help books.
Much like horoscopes in the West, the blood group theory is regularly debunked by scientific experimentation, yet it retains popular appeal. Perhaps one reason for this is that it helps to break the ice in social situations. Japanese people do not always find it easy to express their opinions, so discussing blood types is an indirect way of telling people what you think of them.
What could be the best title for the passage?
A. The blood-type theory
B. Blood and its functions
C. Different theories about blood type
D. Masahiko Nomi, a famous author