The right of the villagers of a particular village to use the water of a particular well is in…

Section 42 makes relevant the opinions of persons likely to know of a general custom or right, and its Explanation defines that expression to include rights common to any considerable class of persons. The illustration to section 42 says the villagers' right to use the water of a particular well is "a general right", so the answer is "A general right". It belongs to a class of persons, the villagers, not to one individual or to the whole public.